Über die wesentliche Maximalität gleichmäßig stark elliptischer Operatoren in L2 (Rn).
Zur Theorie der linearen Operatoren eines J-Raumes. Operatoren, die von kanonischen Zerlegungen reduziert werden.
On a Class of Strongly Nonlinear Elliptic Varionational Inequalities.
A Homotopy Argument for Mappings of Monotone Type in Banach Spaces.
Über Polynome J-symmetrischer Operatoren in J-Räumen.
On a Method of Singular Perturbation Type for Proving the Solvability of Nonlinear Functional Equations in Banach Spaces.
A Remark on a Class of Linear Monotone Operators.
On the Principal Eigenvalue of a Second Order Linear Elliptic Problem with an Indefinite Weight Function.
A Remark on the Preceding paper of Fucik and Krbec.
On Uniqueness of Positive Solutions of Nonlinear Elliptic Boundary Value Problems.
An Isoperimetric Inequality for the Principal Eigenvalue of a Periodic-Parabolic Problem.
Zur Störungstheorie linearer Operatoren in Banachräumen.
Zur Störungstheorie linearer Operatoren: Relative Beschränktheit und relative Kompaktheit von Operatoren in Banachräumen.
On the Relative Completeness of the Generalized Eigenvectors of Elliptic Eigenvalue Problems with Indefinite Weight Functions.
Nonlinear Functional Equations and Eigenvalue Problems in Nonseperable Banach Spaces
Nonlinear perturbations of linear elliptic and parabolic problems at resonance : existence of multiple solutions
On Positive Solutions of a Linear Elliptic Eigenvalue Problem with Neumann Boundary Conditions.
On a Superlinear Elliptic Boundary Value Problem.
Perturbation of Closed Operators and Their Adjoints.
Nonlinear perturbations of linear operators having nullspace with strong unique continuation property (Preliminary communication)
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