@inproceedings{jiang-etal-2026-open,
    title = {Open Schr{\"o}dinger{'}s Closed Box: Identifying Retrieval Augmented Generation in {API}-Accessible Large Language Model Services},
    author = "Jiang, Yukun  and
      Shen, Xinyue  and
      Backes, Michael  and
      Li, Zheng  and
      Zhang, Yang",
    editor = "Liakata, Maria  and
      Moreira, Viviane P.  and
      Zhang, Jiajun  and
      Jurgens, David",
    booktitle = "Proceedings of the 64th Annual Meeting of the {A}ssociation for {C}omputational {L}inguistics (Volume 1: Long Papers)",
    month = jul,
    year = "2026",
    address = "San Diego, California, United States",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-acl/2026.acl-long.208/",
    pages = "4558--4580",
    ISBN = "979-8-89176-390-6"
}