Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1991__73_1_155674, author = {B. Baumann}, title = {Free pro-p groups with operators.}, journal = {Manuscripta mathematica}, pages = {385--396}, publisher = {mathdoc}, volume = {73}, number = {1}, year = {1991}, zbl = {0755.20006}, url = {http://geodesic.mathdoc.fr/item/MM2_1991__73_1_155674/} }
B. Baumann. Free pro-p groups with operators.. Manuscripta mathematica, Tome 73 (1991) no. 1, pp. 385-396. http://geodesic.mathdoc.fr/item/MM2_1991__73_1_155674/