@article{1029001107, author = {O'Malley, Matthew J.}, title = {Finite groups of $R$-automorphisms of $R[[X]]$.}, journal = {Michigan Math. J.}, volume = {20}, number = {1}, year = {1973}, pages = { 277-284}, language = {en}, url = {http://dml.mathdoc.fr/item/1029001107} }
O'Malley, Matthew J. Finite groups of $R$-automorphisms of $R[[X]]$.. Michigan Math. J., Tome 20 (1973) no. 1, pp. 277-284. http://gdmltest.u-ga.fr/item/1029001107/