Towards Effective Long-Form QA with Evidence Augmentation Mengxia Yu author Sara Rosenthal author Mihaela Bornea author Avi Sil author 2023-12 text Proceedings of the Third Workshop on Natural Language Generation, Evaluation, and Metrics (GEM) Sebastian Gehrmann editor Alex Wang editor João Sedoc editor Elizabeth Clark editor Kaustubh Dhole editor Khyathi Raghavi Chandu editor Enrico Santus editor Hooman Sedghamiz editor Association for Computational Linguistics Singapore conference publication yu-etal-2023-towards https://aclanthology.org/2023.gem-1.13/ 2023-12 155 164