Geodesic
The degree of a quasi-ruled mapping and a nonlinear Hilbert problem
Sbornik. Mathematics, Tome 18 (1972) no. 3, pp. 373-396 
A. I. Shnirel'man. The degree of a quasi-ruled mapping and a nonlinear Hilbert problem. Sbornik. Mathematics, Tome 18 (1972) no. 3, pp. 373-396. http://geodesic.mathdoc.fr/item/SM_1972_18_3_a1/
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     title = {The degree of a~quasi-ruled mapping and a~nonlinear {Hilbert} problem},
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we present the theory of the degree of a mapping for a class, containing nonlinear (pseudo) differential operators, of nonlinear mappings in Banach spaces. This theory is applied to prove the existence of solutions to nonlinear boundary value problems in the theory of analytic functions, under some purely topological hypotheses. Bibliography: 11 titles.

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