@article{1102983449, author = {Colby, R. R. and Rutter, E. A.}, title = {${\rm QF}-3$ rings with zero singular ideal.}, journal = {Pacific J. Math.}, volume = {31}, number = {3}, year = {1969}, pages = { 303-308}, language = {en}, url = {http://dml.mathdoc.fr/item/1102983449} }
Colby, R. R.; Rutter, E. A. ${\rm QF}-3$ rings with zero singular ideal.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 303-308. http://gdmltest.u-ga.fr/item/1102983449/