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Jerzy Topp, Lutz Volkmann (1992)
Mathematica Slovaca
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Jerzy Topp, Lutz Volkmann (1992)
Mathematica Slovaca
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Halina Bielak (1983)
Časopis pro pěstování matematiky
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Yair Caro, Juan Rojas, Sergio Ruiz (1996)
Czechoslovak Mathematical Journal
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