@article{01450245, title = {Subgroups of }, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {39}, year = {1998}, pages = {371-378}, zbl = {0937.54023}, language = {en}, url = {http://dml.mathdoc.fr/item/01450245} }
Hernández, Constancio; Tkačenko, Michael. Subgroups of . Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) pp. 371-378. http://gdmltest.u-ga.fr/item/01450245/