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Alessandra Cherubini, Ada Varisco (1988)
Czechoslovak Mathematical Journal
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Alessandra Cherubini, Ada Varisco (1988)
Czechoslovak Mathematical Journal
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Kobayashi, Shigeru, Shimada, Haruki (2001)
Applied Mathematics E-Notes [electronic only]
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Imrich Fabrici (1969)
Matematický časopis
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Jana Galanová (1985)
Mathematica Slovaca
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