%0 Journal Article %A V. S. Guba %A M. V. Sapir %T On subgroups of R.~Thompson's group~$F$ and other diagram groups %J Sbornik. Mathematics %D 1999 %P 1077-1130 %V 190 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1999_190_8_a0/ %G en %F SM_1999_190_8_a0