Jon Saad-Falcon Omar Khattab Christopher Potts Matei Zaharia ARES: An Automated Evaluation Framework for Retrieval-Augmented Generation Systems. 338-354 2024 NAACL-HLT https://doi.org/10.18653/v1/2024.naacl-long.20 conf/naacl/2024 db/conf/naacl/naacl2024.html#Saad-FalconKPZ24