%0 Journal Article %A V. M. Kopytov %A I. I. Mamaev %T Absolute convexity of certain subgroups of an orderable group %J Algebra i logika %D 1968 %P 20-26 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1968_7_2_a1/ %G ru %F AL_1968_7_2_a1