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Books about Protivn:
Deadly technique samurai. Goshin-Jitsu art swift victory over an adverse / Smertonosnye tekhniki samuraev. Goshin-dzhitsu... by Dobkin M.K. (2008)
Wiki information Protivn:
Tomáš Protivný is a Czech professional ice hockey defenceman who currently plays with HC Kometa Brno in the Czech Extraliga.