Chain of dendrites openly unbounded from below. Opěla, David; Pyrih, Pavel; Šámal, Robert — 2001 Mathematica Pannonica
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Irreducible mapping and the lightness of open mappings. Pyrih, Pavel; Bárta, Tomáš; Opěla, David; Růžička, Pavel; Šámal, Robert — 2001 Southwest Journal of Pure and Applied Mathematics [electronic only]