[doc] Fix BibTeX formatting

doc/index.rst

@@ -10,21 +10,23 @@ Package to benchmark and evaluate a range of neural network architectures for
 binary segmentation tasks on 2D Eye Fundus Images (2DFI). It is build using
 PyTorch.
 
-Please use the BibTeX reference below to cite this work::
-
-  @article{laibacher_anjos_2019,
-        author = {Laibacher, Tim and Anjos, Andr\'e},
-        title = "{On the Evaluation and Real-World Usage Scenarios of Deep Vessel Segmentation for Funduscopy}",
-        journal = {arXiv e-prints},
-        keywords = {Computer Science - Computer Vision and Pattern Recognition},
-        year = {2019},
-        month = {Sep},
-        url = {https://arxiv.org/abs/1909.03856},
-        eid = {arXiv:1909.03856},
-        pages = {arXiv:1909.03856},
-        archivePrefix = {arXiv},
-        eprint = {1909.03856},
-  }
+Please use the BibTeX reference below to cite this work:
+
+.. code:: bibtex
+
+   @article{laibacher_anjos_2019,
+         author = {Laibacher, Tim and Anjos, Andr\'e},
+         title = "{On the Evaluation and Real-World Usage Scenarios of Deep Vessel Segmentation for Funduscopy}",
+         journal = {arXiv e-prints},
+         keywords = {Computer Science - Computer Vision and Pattern Recognition},
+         year = {2019},
+         month = {Sep},
+         url = {https://arxiv.org/abs/1909.03856},
+         eid = {arXiv:1909.03856},
+         pages = {arXiv:1909.03856},
+         archivePrefix = {arXiv},
+         eprint = {1909.03856},
+   }
 
 
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