%0 Journal Article %A Antonio Vera López %A Lourdes Ortiz de Elguea %T Hall pi-subgroups and conjugacy classes %J Extracta Mathematicae %D 1989 %P 136 %V 4 %N 3 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/EXMATH_1989__4_3_38325/ %G en %F EXMATH_1989__4_3_38325