@article{GDZPPN002539853, title = {A note on perfect modules over crossed products}, journal = {Revista colombiana de matematicas}, volume = {10}, year = {1976}, pages = {69-74}, zbl = {0333.16027}, url = {http://dml.mathdoc.fr/item/GDZPPN002539853} }
Osterburg, James. A note on perfect modules over crossed products. Revista colombiana de matematicas, Tome 10 (1976) pp. 69-74. http://gdmltest.u-ga.fr/item/GDZPPN002539853/