Normal solvability, solvability and fixed-point theorems
Approximate determination of eigenvalues and eigenvectors of selfadjoint operators
Necessary and sufficient conditions for some convergence methods
New methods for solving linear functional equations with bounded operators
Über die Lösung der im Banachschen Raume definierten nichtlinearen Gleichungen
On the generalization of Wiarda's method of solution of non-linear functional equations
Determination of eigenvalues and eigenfunctions of bounded self-adjoint operators (Preliminary communication)
A note on uniform boundedness principle for nonlinear operators
Differentiability of convex functionals and boundedness of nonlinear operators and functionals
On the solution of functional equations with linear bounded operators (Preliminary communication)
A note on determination of eigenvalues and eigenfunctions of bounded self-adjoint operators
Remarks on nonlinear functionals
Contribution to the solution of non-linear equations
Gradient maps and boundedness of Gâteaux differentials
Some existence theorems for nonlinear problems
Note on the paper of I. Fenyö: On the solution of non-linear equations in Banach space
A note on the continuity properties of nonlinear operators
The solvability of non-linear integral equations
On the differentiability of mappings and convex functionals
Remarks on nonlinear operators and functionals
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