Update README.md

README.md

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 A Greek news summarization model trained on [GreekSum](https://github.com/iakovosevdaimon/GreekSUM).  
 This model is part of a series of models trained as part of our research paper: 
-[Giarelis, N., Mastrokostas, C., & Karacapilidis, N. (2023). GreekT5: A Series of Greek Sequence-to-Sequence Models for News Summarization.](https://arxiv.org/abs/2311.07767)
+[Giarelis, N., Mastrokostas, C., & Karacapilidis, N. (2024) GreekT5: Sequence-to-Sequence Models for Greek News Summarization](https://link.springer.com/chapter/10.1007/978-3-031-63215-0_5) [\[arxiv\]](https://arxiv.org/abs/2311.07767)
 The proposed models were trained and evaluated on the same dataset against [GreekBART](https://arxiv.org/abs/2304.00869).
 For more information see the evaluation section below.