Não informado. (1981). Zbornik Radova Prirodno-Matematickog Fakulteta. University of Novi Sad, Institute of Mathematics, Faculty of Science.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Zbornik Radova Prirodno-Matematickog Fakulteta. Novi Sad, Iugoslavia: University of Novi Sad, Institute of Mathematics, Faculty of Science, 1981.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Zbornik Radova Prirodno-Matematickog Fakulteta. University of Novi Sad, Institute of Mathematics, Faculty of Science, 1981.
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