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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
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Travis Thompson · Proceedings of the American Mathematical Society · 1976 · 113 citations · Full text