added bibtex

README.md

@@ -129,4 +129,17 @@ SentenceTransformer(
 
 ## Citing & Authors
 
-<!--- Describe where people can find more information -->
+The article has been presented at EPIA 2024 conference but the Springer proceedings are not available yet.
+In the meantime, if you use this model you may cite the arXiv preprint:
+
+    @misc{gomes2024opensentenceembeddingsportuguese,
+          title={Open Sentence Embeddings for Portuguese with the Serafim PT* encoders family}, 
+          author={Luís Gomes and António Branco and João Silva and João Rodrigues and Rodrigo Santos},
+          year={2024},
+          eprint={2407.19527},
+          archivePrefix={arXiv},
+          primaryClass={cs.CL},
+          url={https://arxiv.org/abs/2407.19527}, 
+    }
+
+