@article{1102911792, author = {Kleinfeld, Erwin}, title = {A generalization of $(-1,\,1)$ rings.}, journal = {Pacific J. Math.}, volume = {55}, number = {2}, year = {1974}, pages = { 195-202}, language = {en}, url = {http://dml.mathdoc.fr/item/1102911792} }
Kleinfeld, Erwin. A generalization of $(-1,\,1)$ rings.. Pacific J. Math., Tome 55 (1974) no. 2, pp. 195-202. http://gdmltest.u-ga.fr/item/1102911792/