1. https://towardsdatascience.com/face-detection-recognition-and-emotion-detection-in-8-lines-of-code-b2ce32d4d5de
2. https://medium.com/@hinasharma19se/facial-expressions-recognition-b022318d842a
3. https://www.geeksforgeeks.org/introduction-to-support-vector-machines-svm/
4. https://www.javatpoint.com/machine-learning-support-vector-machine-algorithm
5. https://www.python.org/downloads/release/python-370/