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Author Mráz Bohumír Co-authors Rytina Václav Issue data Praha : IDEA SERVIS, 1998 File Books Author Mráz Bohumír Co-authors Rytina Václav Issue data Praha : IDEA SERVIS, 2001 File Books Author Mráz Bohumír Co-authors Rytina Václav Issue data Praha : IDEA SERVIS, 2000 File Books Author Ledvinka Václav Co-authors Mráz Bohumír Vlnas Vít Issue data Praha : Akropolis, 1995 File Books