@article{1181073166, author = {Goeters, H.P.}, title = {When do two groups always have isomorphic extension groups?}, journal = {Rocky Mountain J. Math.}, volume = {20}, number = {4}, year = {1990}, pages = { 129-144}, language = {en}, url = {http://dml.mathdoc.fr/item/1181073166} }
Goeters, H.P. When do two groups always have isomorphic extension groups?. Rocky Mountain J. Math., Tome 20 (1990) no. 4, pp. 129-144. http://gdmltest.u-ga.fr/item/1181073166/