Add paper refs

README.md

@@ -8,7 +8,17 @@ tags:
 ---
 
 # Annif-LLMs4Subjects-data
-Models trained for participating to [SemEval25 Task 5 - LLMs4Subjects](https://sites.google.com/view/llms4subjects/) with [Annif](https://github.com/NatLibFi/Annif).
+Models trained for participating to [SemEval25 Task 5 - LLMs4Subjects](https://sites.google.com/view/llms4subjects/)
+with [Annif](https://github.com/NatLibFi/Annif).
+
+Please see our system description preprint: 
+
+_Suominen, O., Inkinen, J., & Lehtinen, M. (2025). Annif at SemEval-2025 Task 5: Traditional XMTC augmented by LLMs._ https://arxiv.org/abs/2504.19675 (Pre-print)
+
+See also the task description preprint:
+
+_D'Souza, J., Sadruddin, S., Israel, H., Begoin, M. & Slawig, D. (2025). SemEval-2025 Task 5: LLMs4Subjects -- LLM-based Automated Subject Tagging for a National Technical Library's Open-Access Catalog_ https://arxiv.org/abs/2504.07199 (Pre-print)
+
 
 ## Usage