Ceno, Stela, and Gladiola Tigno. “Quasi 2-Metrics, 2-Metrics and Their Decomposition”. Journal of Progressive Research in Mathematics 11, no. 3 (March 15, 2017): 1670-1673. Accessed May 19, 2024. http://www.scitecresearch.com/journals/index.php/jprm/article/view/1064.