%0 Journal Article %A Danchev, Peter V. %T Subgroups of the basic subgroup in a modular group ring %J Mathematica slovaca %D 2005 %P 431-441 %V 55 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2005__55_4_a4/ %G en %F MASLO_2005__55_4_a4