Loet Leydesdorff


1996

doi dblp
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

1997

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

2001

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

2002

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

2003

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

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

2004

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

2005

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

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

2006

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

doi dblp
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

doi dblp
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

2007

doi dblp
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

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

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

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

2008

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

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

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

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

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

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

2009

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

doi dblp
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

doi dblp
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

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

doi dblp
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

doi dblp
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

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

doi dblp
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

2010

doi dblp
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

doi dblp
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

doi dblp
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

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

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

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

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

2011

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

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

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

doi dblp
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

doi dblp
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

doi dblp
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

doi dblp
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

doi dblp
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

2012

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

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

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

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

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

2013

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

doi dblp
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

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

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

doi dblp
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

doi dblp
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

doi dblp
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

2014

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

doi dblp
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

doi dblp
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

doi dblp
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

doi dblp
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

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

doi dblp
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

doi dblp
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

2015

doi dblp
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

doi dblp
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

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

doi dblp
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

2016

doi dblp
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

doi dblp
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

doi dblp
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

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

doi dblp
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

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

doi dblp
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

2017

doi dblp
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

doi dblp
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

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

doi dblp
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

2018

doi dblp
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

2019

doi dblp
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

doi dblp
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

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

2020

doi dblp
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

2021

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