Update README.md

README.md

@@ -20,7 +20,7 @@ triplets to train a sentence encoder using [SBERT](https://www.sbert.net/).
 
 Reference:
 
-'''
+```
 @inbook{Nentidis_2023,
    title={Overview of BioASQ 2023: The Eleventh BioASQ Challenge on Large-Scale Biomedical Semantic Indexing and Question Answering},
    ISBN={9783031424489},
@@ -32,4 +32,4 @@ Reference:
    author={Nentidis, Anastasios and Katsimpras, Georgios and Krithara, Anastasia and Lima López, Salvador and Farré-Maduell, Eulália and Gasco, Luis and Krallinger, Martin and Paliouras, Georgios},
    year={2023},
    pages={227–250} }
-'''
+``