Devi, R., A. Selvakumar, M. Parimala, and S. Jafari. “On Strongly α-𝘐-𝘖𝑝𝑒𝑛 Sets and a New Mapping”. CUBO, A Mathematical Journal 13, no. 1 (March 1, 2011): 1–10. Accessed May 21, 2024. https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1378.