@article{1178242640, author = {Rutter, Edgar A.}, title = {$PF$-modules}, journal = {Tohoku Math. J. (2)}, volume = {23}, number = {4}, year = {1971}, pages = { 201-206}, language = {en}, url = {http://dml.mathdoc.fr/item/1178242640} }
Rutter, Edgar A. $PF$-modules. Tohoku Math. J. (2), Tome 23 (1971) no. 4, pp. 201-206. http://gdmltest.u-ga.fr/item/1178242640/