Update README.md

README.md

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 A Greek abstractive summarization dataset collected from the Greek part of [Wikipedia](https://el.wikipedia.org/), which contains 93,432 articles, their titles and summaries.
 This dataset has been used to train our best-performing model [GreekWiki-umt5-base](https://huggingface.co/IMISLab/IMISLab/GreekWiki-umt5-base/) as part of our upcoming research article:   
-[Giarelis, N., Mastrokostas, C., & Karacapilidis, N. (2024) Greek Wikipedia: A Study on Abstractive Summarization]().   
+[Giarelis, N., Mastrokostas, C., & Karacapilidis, N. (2024) Greek Wikipedia: A Study on Abstractive Summarization](https://dl.acm.org/doi/full/10.1145/3688671.3688769).   
 For information about dataset creation, limitations etc. see the original article.
 
 <img src="Greek Wiki icon.svg" width="200"/>
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 ## Citation
 
 ```
-TBA
+@inproceedings{giarelis2024greek,
+  title={Greek Wikipedia: A Study on Abstractive Summarization},
+  author={Giarelis, Nikolaos and Mastrokostas, Charalampos and Karacapilidis, Nikos},
+  booktitle={Proceedings of the 13th Hellenic Conference on Artificial Intelligence},
+  pages={1--11},
+  year={2024}
+}
 ```