kw.\*:("CONJECTURE HACK")
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ON HACK'S CONJECTURE CONCERNING REACHABILITY IN PETRI NETSGRABOWSKI J.1979; ELEKTRON. INFORM.-VERARBEIT. KYBERN.; DDR; DA. 1979; VOL. 15; NO 7; PP. 339-354; ABS. GER/RUS; BIBL. 2 REF.Article
