@article{1256049418, author = {Westman, Joel J.}, title = {Skew products and the similarity of virtual subgroups}, journal = {Illinois J. Math.}, volume = {21}, number = {4}, year = {1977}, pages = { 332-346}, language = {en}, url = {http://dml.mathdoc.fr/item/1256049418} }
Westman, Joel J. Skew products and the similarity of virtual subgroups. Illinois J. Math., Tome 21 (1977) no. 4, pp. 332-346. http://gdmltest.u-ga.fr/item/1256049418/