et al., Al.Khafaje. “On Generalized Continuous Fuzzy Proper Function from a Fuzzy Topological Space to Another Fuzzy Topological Space”. Baghdad Science Journal 16, no. 1(Suppl.) (March 17, 2019): 0237. Accessed December 7, 2019. http://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/3239.