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Bohdan Zelinka (1988)
Mathematica Slovaca
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Bohdan Zelinka (1988)
Mathematica Slovaca
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Pavol Híc (1989)
Mathematica Slovaca
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Bohdan Zelinka (1987)
Czechoslovak Mathematical Journal
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Ivan Gutman, Yeong Nan Yeh (1995)
Mathematica Slovaca
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