Demonstratio Mathematica > 2007 > Vol. 40, nr 3 > 739-743
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journal ISSN : | 2391-4661 |
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[1] M. E. Abd El-Monsef, S. N. El -Deeb and R. A. Mahmoud, ß-open sets and ß-continuous mappings, Bull. Fac. Sci. Assint Univ. 12 (1983), 77-90.
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[2] M. E. Abd El -Monsef, R. A. Mahmoud and E. R. Lashin, ß-closure and ß-interior , J. Fac. Edu. Ain Shams Univ. 10 (1986), 235-245.
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[3] D. Andrijević, Semi-preopen sets, Mat. Vesnik. 38 (1986), no. 1, 24-32.