Add BibTeX citation for the hackathon collection

README.md

@@ -87,3 +87,16 @@ repository. Paper metadata originates from arXiv and the OpenAIRE Graph
 ## License
 
 CC-BY 4.0.
+
+## Citation
+
+If you reuse this work, please cite:
+
+```bibtex
+@software{echo_dsrn_research_intent_clf,
+  author = {Massimo Roberto Scamarcia},
+  title = {OpenAIRE Graph Evaluator: Research paper classifier and multi-model LLM-as-Judge pipeline},
+  year = {2026},
+  url = {https://huggingface.co/collections/ethicalabs/openaire-ai-hackathon-2026}
+}
+```