Missier, S. Pious, and P. Anbarasi Rodrigo. “Investigating Functions With a^* Closed Sets in Topological Spaces”. Theory and Practice of Mathematics and Computer Science Vol. 6 (February 6, 2021): 14–20. Accessed June 4, 2026. https://stm.bookpi.org/TPMCS-V6/article/view/56.