Staff

Journal article

Hafid, Salim, Sebastian Schellhammer, Yavuz Selim Kartal, Thomas Papastergiou, Stefan Dietze, Sandra Bringay, and Konstantin Todorov. 2025. "An In-depth Analysis of the Linguistic Characteristics of Science Claims on the Web and their Impact on Fact-checking." ACM Transactions on the Web (TWEB) 19 (3): 32. doi: https://doi.org/10.1145/3746170.

Chapter in an edited book

Hafid, Salim, Yavuz Selim Kartal, Sebastian Schellhammer, Vetea Jacot, Sandra Bringay, Stefan Dietze, and Konstantin Todorov. 2025. "Disambiguation of Implicit Scientific References on X." In Proceedings of the 36th ACM Conference on Hypertext and Social Media, 165 - 170. Association for Computing Machinery, New York, United States. doi: https://doi.org/10.1145/3720553.3746676.

Hafid, Salim, Yavuz Selim Kartal, Sebastian Schellhammer, Katarina Boland, Dimitar Dimitrov, Sandra Bringay, Konstantin Todorov, and Stefan Dietze. 2025. "Overview of the CLEF-2025 CheckThat! Lab Task 4 on Scientific Web Discourse." Springer. https://ceur-ws.org/Vol-4038/paper_54.pdf.

Alam, Firoj, Julia Maria Struß, Tanmoy Chakraborty, Stefan Dietze, Salim Hafid, Katerina Korre, Arianna Muti, Preslav Nakov, F. Ruggeri, Sebastian Schellhammer, Vinay Setty, Megha Sundiryal, Konstantin Todorov, and Venktesh V. 2025. "Overview of the CLEF-2025 CheckThat! Lab: Subjectivity, Fact-Checking, Claim Normalization, and Retrieval." In Experimental IR Meets Multilinguality, Multimodality, and Interaction (CLEF 2025), 199–223. Springer Nature. doi: https://doi.org/10.1007/978-3-032-04354-2_13.

Alam, Firoj, Julia Maria Struß, Tanmoy Chakraborty, Stefan Dietze, Salim Hafid, Katerina Korre, Arianna Muti, Preslav Nakov, Fabrizio Ruggeri, Sebastian Schellhammer, Vinay Setty, Megha Sundiryal, Konstantin Todorov, and V Viswanathan. 2025 (Forthcoming). "The CLEF-2025 CheckThat! Lab: Subjectivity, Fact-Checking, Claim Extraction & Normalization, and Retrieval." In 47th European Conference on Information Retrieval (ECIR2025), Springer. https://arxiv.org/abs/2503.14828.

Alam, Firoj, Julia Maria Struß, Tanmoy Chakraborty, Stefan Dietze, Salim Hafid, Katerina Korre, Arianna Muti, Preslav Nakov, F. Ruggeri, Sebastian Schellhammer, Vinay Setty, Megha Sundiryal, Konstantin Todorov, and Venktesh V. 2025. "The CLEF-2025 CheckThat! Lab: Subjectivity, Fact-Checking, Claim Extraction & Normalization, and Retrieval." Part of the book series: Lecture Notes in Computer Science (LNCS) volume 16089, 199–223. Springer Nature Link. https://link.springer.com/chapter/10.1007/978-3-032-04354-2_13.

Schmüser, Juliane, Harshini Sri Ramulu, Noah Wöhler, Christian Stransky, Felix Bensmann, Dimitar Dimitrov, Sebastian Schellhammer, Dominik Wermke, Stefan Dietze, Yasemin Acar, and Sascha Fahl. 2024. "Analyzing Security and Privacy Advice During the 2022 Russian Invasion of Ukraine on Twitter." In CHI '24: Proceedings of the CHI Conference on Human Factors in Computing Systems, edited by Florian Floyd Mueller, Penny Kyburz, Julie R. Williamson, Corina Sas, Max L. Wilson, Phoebe Toups Dugas, and Irina Shklovski, 574, 1-16. New York: Association for Computing Machinery. doi: https://doi.org/10.1145/3613904.3642826.

Gangopadhyay, Susmita, Sebastian Schellhammer, Salim Hafid, Danilo Dessi, C. Koß, Konstantin Todorov, Stefan Dietze, and Hajira Jabeen. 2024. "Investigating Characteristics, Biases and Evolution of Fact-Checked Claims on the Web." In HT '24: Proceedings of the 35th ACM Conference on Hypertext and Social Media, 246-258. New York: ACM. doi: https://doi.org/10.1145/3648188.3675135.

Hemmer, Patrick, Sebastian Schellhammer, Michael Vössing, Johannes Jakubik, and Gerhard Satzger. 2022. "Forming Effective Human-AI Teams: Building Machine Learning Models that Complement the Capabilities of Multiple Experts." In Proceedings of the Thirty-First International Joint Conference on Artificial Intelligence, IJCAI-22, edited by Luc De Raedt, 2478-2484. International Joint Conferences on Artificial Intelligence Organization. doi: https://doi.org/10.24963/ijcai.2022/344.

Hafid, Salim, Sebastian Schellhammer, Sandra Bringay, Konstantin Todorov, and Stefan Dietze. 2022. "SciTweets – A Dataset and Annotation Framework for Detecting Scientific Online Discourse." In CIKM '22: Proceedings of the 31st ACM International Conference on Information & Knowledge Management, edited by Mohammad Al Hasan, and Li Xiong, 3988–3992. New York: Association for Computing Machinery. doi: https://doi.org/10.1145/3511808.3557693.

Data/Software

Gangopadhyay, Susmita, Sebastian Schellhammer, Katarina Boland, Sascha Schüller, Konstantin Todorov, Andon Tchechmedjiev, Benjamin Zapilko, Pavlos Fafalios, Hajira Jabeen, and Stefan Dietze. 2023. ClaimsKG - A Knowledge Graph of Fact-Checked Claims (January, 2023). doi: https://doi.org/10.7802/2620.

Baran, Erdal, Sebastian Schellhammer, Dimitar Dimitrov, and Stefan Dietze. 2022. TweetsCOV19 - A Semantically Annotated Corpus of Tweets About the COVID-19 Pandemic (Part 4, January 2021 - August 2022). doi: https://doi.org/10.7802/2470. https://data.gesis.org/tweetscov19/.

Baran, Erdal, Sebastian Schellhammer, Dimitar Dimitrov, and Stefan Dietze. 2022. TweetsKB: A Public and Large-Scale RDF Corpus of Annotated Tweets (Part 10, Jan 2021 - Dec 2021). doi: https://doi.org/10.7802/2472. https://data.gesis.org/tweetskb/.

Baran, Erdal, Sebastian Schellhammer, Dimitar Dimitrov, and Stefan Dietze. 2022. TweetsKB: A Public and Large-Scale RDF Corpus of Annotated Tweets (Part 11, Jan 2022 - Aug 2022). doi: https://doi.org/10.7802/2473. https://data.gesis.org/tweetskb/.

Presentation at a conference

Hafid, Salim, Yavuz Selim Kartal, Sebastian Schellhammer, Vetea Jacot, Sandra Bringay, Stefan Dietze, and Konstantin Todorov. 2025. "Disambiguation of Implicit Scientific References on X." 36th ACM Conference on Hypertext and Social Media, Chicago IL USA, 2025-09-15.

Hafid, Salim, Yavuz Selim Kartal, Sebastian Schellhammer, Katarina Boland, Dimitar Dimitrov, Sandra Bringay, Konstantin Todorov, and Stefan Dietze. 2025. "Overview of the CLEF-2025 CheckThat! Lab Task 4 on Scientific Web Discourse: Working Notes of the Conference and Labs of the Evaluation Forum ." CLEF 2025, 2025-09-09. https://ceur-ws.org/Vol-4038/paper_54.pdf.

Alam, Firoj, Julia Maria Struß, Tanmoy Chakraborty, Stefan Dietze, Salim Hafid, Katerina Korre, Arianna Muti, Preslav Nakov, F. Ruggeri, Sebastian Schellhammer, Vinay Setty, Megha Sundiryal, Konstantin Todorov, and Venktesh V. 2025. "The CLEF-2025 CheckThat! Lab: Subjectivity, Fact-Checking, Claim Extraction & Normalization, and Retrieval." 47th European Conference on Information Retrieval (ECIR2025), 2025-04-06. https://ecir2025.eu/.

Presentation not at a conference

Schellhammer, Sebastian. 2024. "Preserving and Analysing Large-Scale Twitter Data." GESIS Meet the Experts Season 6: Knowledge technologies for the Social Science: Access to Social Science Data and Services, 2024-06-13.