%0 Journal Article %A È. B. Vinberg %T Groups defined by periodic paired relations %J Sbornik. Mathematics %D 1997 %P 1269-1278 %V 188 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1997_188_9_a0/ %G en %F SM_1997_188_9_a0