Carpintero, C., N. Rajesh, and E. Rosas. “PROPERTIES OF (γ, γ′)-SEMIOPEN SETS”. Italian Journal of Pure and Applied Mathematics 31 (December 31, 2013): 219–226. Accessed July 26, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6141.