2021

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The measurement of "interdisciplinarity" and "synergy" in scientific and extra-scientific collaborations
Loet Leydesdorff | Inga A. Ivanova
2021 Volume 72 Issue 4

2020

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Automated analysis of actor-topic networks on twitter: New approaches to the analysis of socio-semantic networks
Iina Hellsten | Loet Leydesdorff
2020 Volume 71 Issue 1

2019

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Synergy in the knowledge base of U.S. innovation systems at national, state, and regional levels: The contributions of high-tech manufacturing and knowledge-intensive services
Loet Leydesdorff | Caroline S. Wagner | Igone Porto Gómez | Jordan A. Comins | Fred Phillips
2019 Volume 70 Issue 10

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Statistical significance and effect sizes of differences among research universities at the level of nations and worldwide based on the leiden rankings
Loet Leydesdorff | Lutz Bornmann | John Mingers
2019 Volume 70 Issue 5

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The Relative Influences of Government Funding and International Collaboration on Citation Impact
Loet Leydesdorff | Lutz Bornmann | Caroline S. Wagner
2019 Volume 70 Issue 2

2018

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Toward a calculus of redundancy: Signification, codification, and anticipation in cultural evolution
Loet Leydesdorff | Mark William Johnson | Inga A. Ivanova
2018 Volume 69 Issue 10

2017

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Co-word maps and topic modeling: A comparison using small and medium-sized corpora (N 1, 000)
Loet Leydesdorff | Adina Nerghes
2017 Volume 68 Issue 4

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Strategic intelligence on emerging technologies: Scientometric overlay mapping
Daniele Rotolo | Ismael Ràfols | Michael M. Hopkins | Loet Leydesdorff
2017 Volume 68 Issue 1

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Can "hot spots" in the sciences be mapped using the dynamics of aggregated journal-journal citation Relations?
Loet Leydesdorff | Wouter de Nooy
2017 Volume 68 Issue 1

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Identification of long-term concept-symbols among citations: Do common intellectual histories structure citation behavior?
Jordan A. Comins | Loet Leydesdorff
2017 Volume 68 Issue 5

2016

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Replicability and the public/private divide
Loet Leydesdorff | Caroline S. Wagner | Lutz Bornmann
2016 Volume 67 Issue 7

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Highly cited papers in Library and Information Science (LIS): Authors, institutions, and network structures
Johann Bauer | Loet Leydesdorff | Lutz Bornmann
2016 Volume 67 Issue 12

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Aggregated journal-journal citation relations in scopus and web of science matched and compared in terms of networks, maps, and interactive overlays
Loet Leydesdorff | Félix de Moya Anegón | Wouter de Nooy
2016 Volume 67 Issue 9

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The construction of interdisciplinarity: The development of the knowledge base and programmatic focus of the journal Climatic Change, 1977-2013
Iina Hellsten | Loet Leydesdorff
2016 Volume 67 Issue 9

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Journal portfolio analysis for countries, cities, and organizations: Maps and comparisons
Loet Leydesdorff | Gaston Heimeriks | Daniele Rotolo
2016 Volume 67 Issue 3

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The operationalization of "fields" as WoS subject categories (WCs) in evaluative bibliometrics: The cases of "library and information science" and "science & technology studies"
Loet Leydesdorff | Lutz Bornmann
2016 Volume 67 Issue 3

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The normalization of occurrence and Co-occurrence matrices in bibliometrics using Cosine similarities and Ochiai coefficients
Qiuju Zhou | Loet Leydesdorff
2016 Volume 67 Issue 11

2015

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Matching Medline/PubMed data with Web of Science: A routine in R language
Daniele Rotolo | Loet Leydesdorff
2015 Volume 66 Issue 10

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BRICS countries and scientific excellence: A bibliometric analysis of most frequently cited papers
Lutz Bornmann | Caroline S. Wagner | Loet Leydesdorff
2015 Volume 66 Issue 7

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Measuring triple-helix synergy in the Russian innovation systems at regional, provincial, and national levels
Loet Leydesdorff | Evgeniy Perevodchikov | Alexander Uvarov
2015 Volume 66 Issue 6

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Journal maps, interactive overlays, and the measurement of interdisciplinarity on the basis of Scopus data (1996-2012)
Loet Leydesdorff | Félix de Moya Anegón | Vicente P. Guerrero-Bote
2015 Volume 66 Issue 5

2014

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International coauthorship relations in the Social Sciences Citation Index: Is internationalization leading the Network?
Loet Leydesdorff | Han Woo Park | Caroline S. Wagner
2014 Volume 65 Issue 10

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Group-based trajectory modeling (GBTM) of citations in scholarly literature: Dynamic qualities of "transient" and "sticky knowledge claims"
Susanne E. Baumgartner | Loet Leydesdorff
2014 Volume 65 Issue 4

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Detecting the historical roots of research fields by reference publication year spectroscopy (RPYS)
Werner Marx | Lutz Bornmann | Andreas Barth | Loet Leydesdorff
2014 Volume 65 Issue 4

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The "academic trace" of the performance matrix: A mathematical synthesis of the h-index and the integrated impact indicator (I3)
Fred Y. Ye | Loet Leydesdorff
2014 Volume 65 Issue 4

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In search of a network theory of innovations: Relations, positions, and perspectives
Loet Leydesdorff | Petra Ahrweiler
2014 Volume 65 Issue 11

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Mutual redundancies in interhuman communication systems: Steps toward a calculus of processing meaning
Loet Leydesdorff | Inga A. Ivanova
2014 Volume 65 Issue 2

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Patterns of connections and movements in dual-map overlays: A new method of publication portfolio analysis
Chaomei Chen | Loet Leydesdorff
2014 Volume 65 Issue 2

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Interdisciplinarity at the journal and specialty level: The changing knowledge bases of the journal cognitive science
Loet Leydesdorff | Robert L. Goldstone
2014 Volume 65 Issue 1

2013

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How can journal impact factors be normalized across fields of science? An assessment in terms of percentile ranks and fractional counts
Loet Leydesdorff | Ping Zhou | Lutz Bornmann
2013 Volume 64 Issue 1

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Interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal-journal citations
Loet Leydesdorff | Ismael Ràfols | Chaomei Chen
2013 Volume 64 Issue 12

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The Swedish system of innovation: Regional synergies in a knowledge-based economy
Loet Leydesdorff | Øivind Strand
2013 Volume 64 Issue 9

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Statistical tests and research assessments: A comment on Schneider (2012)
Lutz Bornmann | Loet Leydesdorff
2013 Volume 64 Issue 6

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The Triple Helix of university-industry-government relations at the country level and its dynamic evolution under the pressures of globalization
Fred Y. Ye | Susan S. Yu | Loet Leydesdorff
2013 Volume 64 Issue 11

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Field-normalized impact factors (IFs): A comparison of rescaling and fractionally counted IFs
Loet Leydesdorff | Filippo Radicchi | Lutz Bornmann | Claudio Castellano | Wouter de Nooy
2013 Volume 64 Issue 11

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Citation analysis with medical subject Headings (MeSH) using the Web of Knowledge: A new routine
Loet Leydesdorff | Tobias Opthof
2013 Volume 64 Issue 5

2012

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Mapping (USPTO) patent data using overlays to Google Maps
Loet Leydesdorff | Lutz Bornmann
2012 Volume 63 Issue 7

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Publish or patent: Bibliometric evidence for empirical trade-offs in national funding strategies
Robert D. Shelton | Loet Leydesdorff
2012 Volume 63 Issue 3

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Accounting for the uncertainty in the evaluation of percentile ranks
Loet Leydesdorff
2012 Volume 63 Issue 11

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Bibliometric perspectives on medical innovation using the medical subject Headings of PubMed
Loet Leydesdorff | Daniele Rotolo | Ismael Ràfols
2012 Volume 63 Issue 11

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Percentile ranks and the integrated impact indicator (I3)
Loet Leydesdorff | Lutz Bornmann
2012 Volume 63 Issue 9

2011

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The structure of the Arts & Humanities Citation Index: A mapping on the basis of aggregated citations among 1, 157 journals
Loet Leydesdorff | Björn Hammarfelt | Alkim Almila Akdag Salah
2011 Volume 62 Issue 12

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Turning the tables on citation analysis one more time: Principles for comparing sets of documents
Loet Leydesdorff | Lutz Bornmann | Rüdiger Mutz | Tobias Opthof
2011 Volume 62 Issue 7

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Which cities produce more excellent papers than can be expected? A new mapping approach, using Google Maps, based on statistical significance testing
Lutz Bornmann | Loet Leydesdorff
2011 Volume 62 Issue 10

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Scopus' SNIP indicator: Reply to Moed
Loet Leydesdorff | Tobias Opthof
2011 Volume 62 Issue 1

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How to evaluate universities in terms of their relative citation impacts: Fractional counting of citations and the normalization of differences among disciplines
Loet Leydesdorff | Jung C. Shin
2011 Volume 62 Issue 6

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Integrated impact indicators compared with impact factors: An alternative research design with policy implications
Loet Leydesdorff | Lutz Bornmann
2011 Volume 62 Issue 11

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How fractional counting of citations affects the impact factor: Normalization in terms of differences in citation potentials among fields of science
Loet Leydesdorff | Lutz Bornmann
2011 Volume 62 Issue 2

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Local emergence and global diffusion of research technologies: An exploration of patterns of network formation
Loet Leydesdorff | Ismael Ràfols
2011 Volume 62 Issue 5

2010

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Science overlay maps: A new tool for research policy and library management
Ismael Ràfols | Alan L. Porter | Loet Leydesdorff
2010 Volume 61 Issue 9

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A comparative study on communication structures of Chinese journals in the social sciences
Ping Zhou | Xinning Su | Loet Leydesdorff
2010 Volume 61 Issue 7

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Journal maps on the basis of Scopus data: A comparison with the Journal Citation Reports of the ISI
Loet Leydesdorff | Félix de Moya Anegón | Vicente P. Guerrero-Bote
2010 Volume 61 Issue 2

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Maps on the basis of the Arts & Humanities Citation Index: The journals Leonardo and Art Journal versus "digital humanities" as a topic
Loet Leydesdorff | Alkim Almila Akdag Salah
2010 Volume 61 Issue 4

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The communication of meaning and the structuration of expectations: Giddens' "structuration theory" and Luhmann's "self-organization"
Loet Leydesdorff
2010 Volume 61 Issue 10

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Mapping the geography of science: Distribution patterns and networks of relations among cities and institutes
Loet Leydesdorff | Olle Persson
2010 Volume 61 Issue 8

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Scopus's source normalized impact per paper (SNIP) versus a journal impact factor based on fractional counting of citations
Loet Leydesdorff | Tobias Opthof
2010 Volume 61 Issue 11

2009

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How are new citation-based journal indicators adding to the bibliometric toolbox?
Loet Leydesdorff
2009 Volume 60 Issue 7

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A global map of science based on the ISI subject categories
Loet Leydesdorff | Ismael Ràfols
2009 Volume 60 Issue 2

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Content-based and algorithmic classifications of journals: Perspectives on the dynamics of scientific communication and indexer effects
Ismael Ràfols | Loet Leydesdorff
2009 Volume 60 Issue 9

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National and international dimensions of the Triple Helix in Japan: University-industry-government versus international coauthorship relations
Loet Leydesdorff | Yuan Sun
2009 Volume 60 Issue 4

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The delineation of an interdisciplinary specialty in terms of a journal set: The case of communication studies
Loet Leydesdorff | Carole Probst
2009 Volume 60 Issue 8

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The relation between Pearson's correlation coefficient r and Salton's cosine measure
Leo Egghe | Loet Leydesdorff
2009 Volume 60 Issue 5

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Definition and identification of journals as bibliographic and subject entities: Librarianship versus ISI Journal Citation Reports methods and their effect on citation measures
Stephen J. Bensman | Loet Leydesdorff
2009 Volume 60 Issue 6

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An indicator of research front activity: Measuring intellectual organization as uncertainty reduction in document sets
Diana Lucio-Arias | Loet Leydesdorff
2009 Volume 60 Issue 12

2008

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Dynamic animations of journal maps: Indicators of structural changes and interdisciplinary developments
Loet Leydesdorff | Thomas Schank
2008 Volume 59 Issue 11

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Patent classifications as indicators of intellectual organization
Loet Leydesdorff
2008 Volume 59 Issue 10

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Caveats for the use of citation indicators in research and journal evaluations
Loet Leydesdorff
2008 Volume 59 Issue 2

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Main-path analysis and path-dependent transitions in HistCite^-based historiograms
Diana Lucio-Arias | Loet Leydesdorff
2008 Volume 59 Issue 12

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Co-word analysis using the Chinese character set
Loet Leydesdorff | Ping Zhou
2008 Volume 59 Issue 9

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On the normalization and visualization of author co-citation data: Salton's Cosine versus the Jaccard index
Loet Leydesdorff
2008 Volume 59 Issue 1

2007

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Should co-occurrence data be normalized? A rejoinder
Loet Leydesdorff
2007 Volume 58 Issue 14

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A comparison between the China Scientific and Technical Papers and Citations Database and the Science Citation Index in terms of journal hierarchies and interjournal citation relations
Ping Zhou | Loet Leydesdorff
2007 Volume 58 Issue 2

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Betweenness centrality as an indicator of the interdisciplinarity of scientific journals
Loet Leydesdorff
2007 Volume 58 Issue 9

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Visualization of the citation impact environments of scientific journals: An online mapping exercise
Loet Leydesdorff
2007 Volume 58 Issue 1

2006

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Co-occurrence matrices and their applications in information science: Extending ACA to the Web environment
Loet Leydesdorff | Liwen Qiu Vaughan
2006 Volume 57 Issue 12

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Can scientific journals be classified in terms of aggregated journal-journal citation relations using the Journal Citation Reports?
Loet Leydesdorff
2006 Volume 57 Issue 5

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Classification and powerlaws: The logarithmic transformation
Loet Leydesdorff | Stephen J. Bensman
2006 Volume 57 Issue 11

2005

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Mapping the Chinese Science Citation Database in terms of aggregated journal-journal citation relations
Loet Leydesdorff | Jin Bihui
2005 Volume 56 Issue 14

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Similarity measures, author cocitation analysis, and information theory
Loet Leydesdorff
2005 Volume 56 Issue 7

2004

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The university-industry knowledge relationship: Analyzing patents and the science base of technologies
Loet Leydesdorff
2004 Volume 55 Issue 11

2003

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Rejoinder to Van den Besselaar's letter entitled Descriptive statistics, inferential statistics, rhetorical statistics
Loet Leydesdorff
2003 Volume 54 Issue 11

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Empirical evidence of self-organization? A rejoinder
Loet Leydesdorff
2003 Volume 54 Issue 8

2002

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Dynamic and evolutionary updates of classificatory schemes in scientific journal structures
Loet Leydesdorff
2002 Volume 53 Issue 12

2001

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The self-organization of the European Information Society: The case of biotechnology
Loet Leydesdorff | Gaston Heimeriks
2001 Volume 52 Issue 13

1997

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Why Words and Co-Words Cannot Map the Development of the Sciences
Loet Leydesdorff
1997 Volume 48 Issue 5

1996

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Mapping Change in Scientific Specialties: A Scientometric Reconstruction of the Development of Artificial Intelligence
Peter van den Besselaar | Loet Leydesdorff
1996 Volume 47 Issue 6

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