Não informado. (1981). Zbornik Radova Prirodno-Matematickog Fakulteta. University of Novi Sad, Institute of Mathematics, Faculty of Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Zbornik Radova Prirodno-Matematickog Fakulteta. Novi Sad, Iugoslavia: University of Novi Sad, Institute of Mathematics, Faculty of Science, 1981.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Zbornik Radova Prirodno-Matematickog Fakulteta. University of Novi Sad, Institute of Mathematics, Faculty of Science, 1981.
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