Approximation solvability of nonlinear equations.
(English).
In:
John, Oldřich
and
Kufner, Alois (eds.):
Nonlinear Analysis, Function Spaces and Applications,
Proceedings of the Spring School held in Písek, 1982.
Vol. 2.
BSB B. G. Teubner Verlagsgesellschaft, Leipzig, 1982.
pp. 234-257