Krasnoselskii, M. A. 1920- Geometrical methods of nonlinear analysis / M.A. Krasnoselskii, P.P. Zabreiko ; translated by Christian Fenske. - Berlin : Springer-Verlag, 1984 - 409 p. ; 24 cm. - Grundlehren der mathematischen Wissenschaften ; 263 . LCCN: 83-16986 Subjects--Topical Terms: Operator equations, Nonlinear--Numerical solutions