K. Atanassov
Notes on Number Theory and Discrete Mathematics, ISSN 1310–5132
Volume 5, 1999, Number 4, Pages 135–137
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K. Atanassov
CLBME – Bulg. Academy of Sci.,
P.O. Box 12, Sofia-1113, Bulgaria
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Atanassov, K. (1999). One extremal problem. 9. Notes on Number Theory and Discrete Mathematics, 5(4), 135-137.