Update README.md

README.md

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 This is a flan-t5-based model pre-trained on VG scene graph parsing dataset first and then fine-tuned on FACTUAL scene graph parsing dataset.
-See model details from 'https://github.com/zhuang-li/FACTUAL/tree/main '.
+See model details from 'https://github.com/zhuang-li/FACTUAL/tree/main '.
+
+If you use the model, please cite:
+
+```
+@inproceedings{li-etal-2023-factual,
+    title = "{FACTUAL}: A Benchmark for Faithful and Consistent Textual Scene Graph Parsing",
+    author = "Li, Zhuang  and
+      Chai, Yuyang  and
+      Zhuo, Terry Yue  and
+      Qu, Lizhen  and
+      Haffari, Gholamreza  and
+      Li, Fei  and
+      Ji, Donghong  and
+      Tran, Quan Hung",
+    booktitle = "Findings of the Association for Computational Linguistics: ACL 2023",
+    month = jul,
+    year = "2023",
+    address = "Toronto, Canada",
+    publisher = "Association for Computational Linguistics",
+    url = "https://aclanthology.org/2023.findings-acl.398",
+    pages = "6377--6390",
+}
+```