Philipp Christmann

2026

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PerQA: A Benchmark for Temporally Sensitive Questions on Heterogeneous Personal Data.
Philipp Christmann|Gerhard Weikum
Companion Proceedings of the ACM Web Conference 2026, WWW Companion 2026, Dubai, United Arab Emirates, 29 June 2026 - 3 July 2026

2025

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Report on the 9th Workshop on Search-Oriented Conversational Artificial Intelligence (SCAI 2025) at IJCAI 2025.
Svitlana Vakulenko|Philipp Christmann|Isabel Feustel|Vaibhav Adlakha|Vahid Sadiri Javadi|Patrícia Schmidtová
SIGIR Forum 2025 Volume 59 Issue 2
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The ReQAP System for Question Answering over Personal Information.
Philipp Christmann|Gerhard Weikum
Proceedings of the 34th ACM International Conference on Information and Knowledge Management, CIKM 2025, Seoul, Republic of Korea, November 10-14, 2025

2024

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Faithful Temporal Question Answering over Heterogeneous Sources.
Zhen Jia|Philipp Christmann|Gerhard Weikum
Proceedings of the ACM on Web Conference 2024, WWW 2024, Singapore, May 13-17, 2024
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CompMix: A Benchmark for Heterogeneous Question Answering.
Philipp Christmann|Rishiraj Saha Roy|Gerhard Weikum
Companion Proceedings of the ACM on Web Conference 2024, WWW 2024, Singapore, Singapore, May 13-17, 2024
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TIQ: A Benchmark for Temporal Question Answering with Implicit Time Constraints.
Zhen Jia|Philipp Christmann|Gerhard Weikum
Companion Proceedings of the ACM on Web Conference 2024, WWW 2024, Singapore, Singapore, May 13-17, 2024

2023

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Explainable Conversational Question Answering over Heterogeneous Sources via Iterative Graph Neural Networks.
Philipp Christmann|Rishiraj Saha Roy|Gerhard Weikum
Proceedings of the 46th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2023, Taipei, Taiwan, July 23-27, 2023

2022

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Explainable Conversational Question Answering over Heterogeneous Sources.
Philipp Christmann
SIGIR '22: The 45th International ACM SIGIR Conference on Research and Development in Information Retrieval, Madrid, Spain, July 11 - 15, 2022
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Conversational Question Answering on Heterogeneous Sources.
Philipp Christmann|Rishiraj Saha Roy|Gerhard Weikum
SIGIR '22: The 45th International ACM SIGIR Conference on Research and Development in Information Retrieval, Madrid, Spain, July 11 - 15, 2022
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Beyond NED: Fast and Effective Search Space Reduction for Complex Question Answering over Knowledge Bases.
Philipp Christmann|Rishiraj Saha Roy|Gerhard Weikum
WSDM '22: The Fifteenth ACM International Conference on Web Search and Data Mining, Virtual Event / Tempe, AZ, USA, February 21 - 25, 2022

2019

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Look before you Hop: Conversational Question Answering over Knowledge Graphs Using Judicious Context Expansion.
Philipp Christmann|Rishiraj Saha Roy|Abdalghani Abujabal|Jyotsna Singh|Gerhard Weikum
Proceedings of the 28th ACM International Conference on Information and Knowledge Management, CIKM 2019, Beijing, China, November 3-7, 2019.