1. https://www.unodc.org/documents/data-and-analysis/Crimestatistics/International_Statistics_on_Crime_and_Justice.pdf
2. https://towardsdatascience.com/face-recognition-how-lbph-works-90ec258c3d6b
3. https://towardsdatascience.com/facial-mapping-landmarks-with-dlib-python-160abcf7d672
4. Toygar, O., Acan, A.: Face recognition using PCA, LDA and ICA approaches on colored images. J. Electr. Electron. Eng. 3(1), 735–743 (2003)
5. https://www.pyimagesearch.com/2017/04/03/facial-landmarks-dlib-opencv-python/