On local spectral radius
On local and global moduli of convexity
On the strict convexity of the polar operator
Some existence theorems for nonlinear equations of Hammerstein type (Preliminary communication)
Some fixed point theorems
Surjectivity and fixed point theorems (Preliminary communication)
On norms and subsets of linear spaces
Generalized concentrative mappings and their fixed points
Fixed point theorems, Nemyckii and Uryson operators, and continuity of nonlinear mappings
Some fixed point theorems in metric and Banach spaces
Continuity properties of nonlinear mappings
On the radius of a set in a Hilbert space
Equivalence of some geometric and related results of nonlinear functional analysis
The Hilbert projective metric and an equation in a -algebra
On the continuity and differentiability properties of convex functionals
A note on geometric characterization of Fréchet differentiability
Studium matematiky na německých univerzitách
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