CRFR: Improving Conversational Recommender Systems via Flexible Fragments Reasoning on Knowledge Graphs Jinfeng Zhou author Bo Wang author Ruifang He author Yuexian Hou author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication zhou-etal-2021-crfr 10.18653/v1/2021.emnlp-main.355 https://aclanthology.org/2021.emnlp-main.355/ 2021-11 4324 4334