1.
U. M. Prajapati, R. M. Gajjar. Cordiality in the Context of Duplication in Helm and Closed Helm. Int. J. Math. And Appl. [Internet]. 2018 Jan. 1 [cited 2024 May 17];6(1 - A):139-45. Available from: http://ijmaa.in/index.php/ijmaa/article/view/907