Sallam Abualhaija, Fatma Basak Aydemir, Alessio Ferrari 0001, Jin Guo. Preface: 4th Workshop on Natural Language Processing for Requirements Engineering (NLP4RE 2021). In Fatma Basak Aydemir, Catarina Gralha, Maya Daneva, Eduard C. Groen, Andrea Herrmann, Patrick Mennig, Sallam Abualhaija, Alessio Ferrari, Jin Guo, Renata Guizzardi, Jennifer Horkoff, Anna Perini, Angelo Susi, Travis Breaux, Xavier Franch, Neil Ernst, Elda Paja, Norbert Seyff, editors, Joint Proceedings of REFSQ 2021 Workshops, OpenRE, Poster and Tools Track, and Doctoral Symposium co-located with the 27th International Conference on Requirements Engineering: Foundation for Software Quality (REFSQ 2021), Essen, Germany, April 12, 2021. Volume 2857 of CEUR Workshop Proceedings, CEUR-WS.org, 2021. [doi]
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