@article{1029001103, author = {Motzkin, T. S. and O'Neill, Barret and Straus, E. G.}, title = {Isolated subgroups.}, journal = {Michigan Math. J.}, volume = {20}, number = {1}, year = {1973}, pages = { 235-248}, language = {en}, url = {http://dml.mathdoc.fr/item/1029001103} }
Motzkin, T. S.; O'Neill, Barret; Straus, E. G. Isolated subgroups.. Michigan Math. J., Tome 20 (1973) no. 1, pp. 235-248. http://gdmltest.u-ga.fr/item/1029001103/