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 (CIKM, 2019)

Efficient Contextualization using Top-k Operators for Question Answering over Knowledge Graphs. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (CoRR, 2021)

Question Entity and Relation Linking to Knowledge Bases via CLOCQ (full paper). - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (SemREC/SMART@ISWC, 2022)

Explainable Conversational Question Answering over Heterogeneous Sources. - Philipp Christmann (SIGIR, 2022)

Conversational Question Answering on Heterogeneous Sources. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (SIGIR, 2022)

Beyond NED: Fast and Effective Search Space Reduction for Complex Question Answering over Knowledge Bases. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (WSDM, 2022)

CLOCQ: A Toolkit for Fast and Easy Access to Knowledge Bases. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (BTW, 2023)

Explainable Conversational Question Answering over Heterogeneous Sources via Iterative Graph Neural Networks. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (SIGIR, 2023)

Retrieving Contextual Information for Long-Form Question Answering using Weak Supervision. - Philipp Christmann; Svitlana Vakulenko; Ionut Sorodoc; Bill Byrne; Adrià de Gispert (EMNLP (Findings), 2024)

CompMix: A Benchmark for Heterogeneous Question Answering. - Philipp Christmann; Rishiraj Saha Roy; Gerhard Weikum (WWW (Companion Volume), 2024)

Faithful Temporal Question Answering over Heterogeneous Sources. - Zhen Jia; Philipp Christmann; Gerhard Weikum (WWW, 2024)

TIQ: A Benchmark for Temporal Question Answering with Implicit Time Constraints. - Zhen Jia; Philipp Christmann; Gerhard Weikum (WWW (Companion Volume), 2024)

RAG-based Question Answering over Heterogeneous Data and Text. - Philipp Christmann; Gerhard Weikum (IEEE Data Eng. Bull., 2024)

Recursive Question Understanding for Complex Question Answering over Heterogeneous Personal Data. - Philipp Christmann; Gerhard Weikum (ACL (Findings), 2025)

The ReQAP System for Question Answering over Personal Information. - Philipp Christmann; Gerhard Weikum (CoRR, 2025)