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Pavel Tomasta, Eliška Tomová (1988)
Czechoslovak Mathematical Journal
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Pavel Tomasta, Eliška Tomová (1988)
Czechoslovak Mathematical Journal
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Mohammed Z. Abu-Sbeih (1999)
Mathematica Slovaca
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Lawrence Moss (1989)
Fundamenta Mathematicae
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A. K. Dewdney, Frank Harary (1976)
Czechoslovak Mathematical Journal
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