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@article{MAN_1968__177_161714, author = {W.V. PETRYSHYN}, title = {On the {Approximation-Solvability} of {Nonlinear} {Equations.}}, journal = {Mathematische Annalen}, pages = {156--164}, publisher = {mathdoc}, volume = {177}, year = {1968}, zbl = {0162.20301}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__177_161714/} }
W.V. PETRYSHYN. On the Approximation-Solvability of Nonlinear Equations.. Mathematische Annalen, Tome 177 (1968), pp. 156-164. http://geodesic.mathdoc.fr/item/MAN_1968__177_161714/