S.Kavitha Bharathi, and S.N.Kiruthika. “Robust Partial Face Recognition Using Hog Feature Points Matching and Minimum Distance Classifier”. International Journal of Intellectual Advancements and Research in Engineering Computations, vol. 5, no. 2, Aug. 2017, pp. 1621-6, https://ijiarec.com/ijiarec/article/view/1542.