[1]
TADROS, S.F. and KHALAF, A.B. 1992. ON REGULAR SEMI-OPEN SETS AND $S^*$-CLOSED SPACES. Tamkang Journal of Mathematics. 23, 4 (Dec. 1992), 337–348. DOI:https://doi.org/10.5556/j.tkjm.23.1992.4557.