| 2026 | WWW | PerQA: A Benchmark for Temporally Sensitive Questions on Heterogeneous Personal Data. | Philipp Christmann, Gerhard Weikum |
| 2026 | SIGIR | The 10th Workshop on Search-Oriented Conversational Artificial Intelligence (SCAI'26). | Philipp Christmann, Roxana Petcu, Sneha Singhania, Mohammad Aliannejadi, Marcel Gohsen, Svitlana Vakulenko |
| 2025 | ACL | Recursive Question Understanding for Complex Question Answering over Heterogeneous Personal Data. | Philipp Christmann, Gerhard Weikum |
| 2025 | CIKM | The ReQAP System for Question Answering over Personal Information. | Philipp Christmann, Gerhard Weikum |
| 2024 | EMNLP | Retrieving Contextual Information for Long-Form Question Answering using Weak Supervision. | Philipp Christmann, Svitlana Vakulenko, Ionut Sorodoc, Bill Byrne, Adri de Gispert |
| 2024 | WWW | CompMix: A Benchmark for Heterogeneous Question Answering. | Philipp Christmann, Rishiraj Saha Roy, Gerhard Weikum |
| 2024 | WWW | Faithful Temporal Question Answering over Heterogeneous Sources. | Zhen Jia, Philipp Christmann, Gerhard Weikum |
| 2024 | WWW | TIQ: A Benchmark for Temporal Question Answering with Implicit Time Constraints. | Zhen Jia, Philipp Christmann, Gerhard Weikum |
| 2023 | BTW | CLOCQ: A Toolkit for Fast and Easy Access to Knowledge Bases. | Philipp Christmann, Rishiraj Saha Roy, Gerhard Weikum |
| 2023 | SIGIR | Explainable Conversational Question Answering over Heterogeneous Sources via Iterative Graph Neural Networks. | Philipp Christmann, Rishiraj Saha Roy, Gerhard Weikum |
| 2022 | SIGIR | Explainable Conversational Question Answering over Heterogeneous Sources. | Philipp Christmann |
| 2022 | SIGIR | Conversational Question Answering on Heterogeneous Sources. | Philipp Christmann, Rishiraj Saha Roy, Gerhard Weikum |
| 2022 | WSDM | Beyond NED: Fast and Effective Search Space Reduction for Complex Question Answering over Knowledge Bases. | Philipp Christmann, Rishiraj Saha Roy, Gerhard Weikum |
| 2019 | CIKM | 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 |