On -open setes.
Andrijević, Dimitrije (1996)
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Andrijević, Dimitrije (1996)
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B. Nath (1971)
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Navalagi, G.B. (2002)
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Fundamenta Mathematicae
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Abd El-Monsef, M.E., Kozae, A.M., Abo Khadra, A.A. (1996)
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