@article{1102978059, author = {Neuberger, J. W.}, title = {Existence of a spectrum for nonlinear transformations.}, journal = {Pacific J. Math.}, volume = {31}, number = {3}, year = {1969}, pages = { 157-159}, language = {en}, url = {http://dml.mathdoc.fr/item/1102978059} }
Neuberger, J. W. Existence of a spectrum for nonlinear transformations.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 157-159. http://gdmltest.u-ga.fr/item/1102978059/