참고문헌
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- Amer. Math. Monthly v.70 Semi-open sets and semi-continuity in topological spaces N.Levin https://doi.org/10.2307/2312781
- Annales de la societe scientifique de Bruxelles, T. v.89 no.III Some new separation axioms S.N.Maheshwari;R.Prasad
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