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by Abramsky, Samson; Kontinen, Juha; Väänänen, Jouko; et al.
by Creignou, Nadia; Kolaitis, Phokion G.; Vollmer, Heribert
by Vollmer, Heribert
by Heribert Vollmer
by Nadia Creignou; ?Phokion G. Kolaitis; ?Heribert Vollmer