Update README.md

README.md

@@ -220,6 +220,30 @@ If you find this project useful in your research and wish to cite it, please use
 
 ```
 
+[SELFIES](https://doi.org/10.1088/2632-2153/aba947)
+```bibtex
+@article{krenn2020selfies,
+  title={Self-referencing embedded strings (SELFIES): A 100\% robust molecular string representation},
+  author={Krenn, Mario and H{\"a}se, Florian and Nigam, AkshatKumar and Friederich, Pascal and Aspuru-Guzik, Alan},
+  journal={Machine Learning: Science and Technology},
+  volume={1},
+  number={4},
+  pages={045024},
+  year={2020},
+  doi={10.1088/2632-2153/aba947}
+}
+```
+
+[Ranger21](https://arxiv.org/abs/2106.13731)
+```bibtex
+@article{wright2021ranger21,
+      title={Ranger21: a synergistic deep learning optimizer}, 
+      author={Wright, Less and Demeure, Nestor},
+      year={2021},
+      journal={arXiv preprint arXiv:2106.13731},
+}
+```
+
 ## Contact & Support My Work
 
 G Bayu ([email protected])