Acta Mathematica Academiae Scientiarum Hungaricae · 1996 · 26 citations · 8 references
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Semi-Open Sets and Semi-Continuity in Topological Spaces
Norman Levine · American Mathematical Monthly · 1963 · 1.3K citations
On some classes of nearly open sets
Olav Njåstad · Pacific Journal of Mathematics · 1965 · 1.1K citations · Full text
A Decomposition of Continuity in Topological Spaces
Norman Levine · American Mathematical Monthly · 1961 · 236 citations