K. Arumugam, R. Abdul Saleem, and S. Arunvasan. “Solving Fuzzy Assignment Problem Using Symmetric Hexagonal Fuzzy Number”. International Journal of Mathematics And its Applications 6, no. 1 - D (March 1, 2018): 741–746. Accessed April 22, 2026. http://ijmaa.in/index.php/ijmaa/article/view/1135.