Akarapu Swarna, V. Venkata Krishna, Supreethi K. P. “Age Classification Based on Relative-Features Derived on Circular and Elliptical Neighborhoods Using Machine Learning Classifiers”. Design Engineering (December 2, 2021): 1845 - 1868. Accessed July 16, 2024. http://thedesignengineering.com/index.php/DE/article/view/7134.