Não informado. (1951). Czechoslovak Mathematical Journal. Czechoslovak Akademy of Sciences.
Chicago-referens (17:e uppl.)Não informado. Czechoslovak Mathematical Journal. Praha: Czechoslovak Akademy of Sciences, 1951.
MLA-referens (8:e uppl.)Não informado. Czechoslovak Mathematical Journal. Czechoslovak Akademy of Sciences, 1951.
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