Abrishami-Moghaddam, Majid. “On the Triangle Inequality in Quasi 2-Normed Spaces and a New Characterization of 2-Inner Product Spaces”. Scientific Journal of Pure and Applied Sciences 3, no. 6 (June 30, 2014): 433-437. Accessed July 22, 2024. http://sjournals.com/index.php/sjpas/article/view/875.