On -open setes.
Andrijević, Dimitrije (1996)
Matematichki Vesnik
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Andrijević, Dimitrije (1996)
Matematichki Vesnik
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D. Andrijević (1987)
Matematički Vesnik
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Abd El-Monsef, M.E., Kozae, A.M., Abo Khadra, A.A. (1996)
International Journal of Mathematics and Mathematical Sciences
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B. Nath (1971)
Compositio Mathematica
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S. Crossley, S. Hildebrand (1972)
Fundamenta Mathematicae
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Maheshwari, S.N., Prasad, R. (1975)
Portugaliae mathematica
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Nour, T.M. (1998)
International Journal of Mathematics and Mathematical Sciences
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Maximilian Ganster, Dragan S. Janković, Ivan L. Reilly (1990)
Commentationes Mathematicae Universitatis Carolinae
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