Linear Elliptic Differential Systems and Eigenvalue Problems (Lecture Notes in Mathematics, 8)
Seminar on Functional Operators and Equations: Forschungsinstitut Für Mathematik, Eth, Zürich, October 1965 - July 1966 (Lecture Notes in Mathematics, 33)
Bifurcation Theory An Introduction with Applications to PDEs
Coincidence Degree and Nonlinear Differential Equations (Lecture Notes in Mathematics, No.568) (Lecture Notes in Mathematics, 568)
Spectral Analysis of Nonlinear Operators (Lecture Notes in Mathematics, 346)
Methods of Bifurcation Theory (Grundlehren der mathematischen Wissenschaften)
Linear Operators and Operator Equations
Global Solution Branches of Two Point Boundary Value Problems (Lecture Notes in Mathematics, 1458)
Bifurcations and Catastrophes Geometry of Solutions to Nonlinear Problems
Bifurcation of Extremals in Optimal Control (Lecture Notes in Mathematics, 1216)