@article{1028998772, author = {Newman, M.}, title = {Some free products of cyclic groups.}, journal = {Michigan Math. J.}, volume = {9}, number = {1}, year = {1962}, pages = { 369-373}, language = {en}, url = {http://dml.mathdoc.fr/item/1028998772} }
Newman, M. Some free products of cyclic groups.. Michigan Math. J., Tome 9 (1962) no. 1, pp. 369-373. http://gdmltest.u-ga.fr/item/1028998772/