Update README.md

README.md

@@ -30,6 +30,7 @@ After the selection of 90% of data for training, the following hyperparameters w
 
 ### Citation
 If using these models, please cite the following paper:
+```
 @article{Stepanov2023ComparativeAO,
   title={Comparative analysis of classification techniques for topic-based biomedical literature categorisation},
   author={Ihor Stepanov and Arsentii Ivasiuk and Oleksandr Yavorskyi and Alina Frolova},
@@ -37,4 +38,5 @@ If using these models, please cite the following paper:
   year={2023},
   volume={14},
   url={https://api.semanticscholar.org/CorpusID:265428155}
-}
+}
+```