@article{GDZPPN002034336, title = {On commutativity of P.I. rings.}, journal = {Aequationes mathematicae}, volume = {26}, year = {1983}, pages = {83-88}, zbl = {0537.16028}, url = {http://dml.mathdoc.fr/item/GDZPPN002034336} }
Bell, Howard E. On commutativity of P.I. rings.. Aequationes mathematicae, Tome 26 (1983) pp. 83-88. http://gdmltest.u-ga.fr/item/GDZPPN002034336/