Update references

Author: christianversloot

README.md

@@ -121,7 +121,11 @@ from extra_keras_datasets import kmnist
 ---
 
 ## Contributors and other references
-* **[tlindbloom](https://stackoverflow.com/users/4008755/tlindbloom) on StackOverflow:** [loading EMNIST-letters dataset](https://stackoverflow.com/questions/51125969/loading-emnist-letters-dataset/53547262#53547262) in [emnist.py](./emnist.py).
+* EMNIST dataset:
+  * Cohen, G., Afshar, S., Tapson, J., & van Schaik, A. (2017). EMNIST: an extension of MNIST to handwritten letters. Retrieved from http://arxiv.org/abs/1702.05373
+  * **[tlindbloom](https://stackoverflow.com/users/4008755/tlindbloom) on StackOverflow:** [loading EMNIST-letters dataset](https://stackoverflow.com/questions/51125969/loading-emnist-letters-dataset/53547262#53547262) in [emnist.py](./emnist.py).
+* KMNIST dataset:
+  * Clanuwat, T., Bober-Irizar, M., Kitamoto, A., Lamb, A., Yamamoto, K., & Ha, D. (2018). Deep learning for classical Japanese literature. arXiv preprint arXiv:1812.01718. Retrieved from https://arxiv.org/abs/1812.01718
 
 ## License
 The licenseable parts of this repository are licensed under a [MIT License](./LICENSE), so you're free to use this repo in your machine learning projects / blogs / exercises, and so on. Happy engineering! 🚀