Oscillation Theory (Lecture Notes in Mathematics, 324)
Regular Boundary Value Problems Associated with Pairs of Ordinary Differential Expressions (Lecture Notes in Mathematics, 858)
Kongruenzklassengeometrien (Lecture Notes in Mathematics, 113) (German Edition)
Discontinuous Cebysev Systems (Lecture Notes in Mathematics, 707)
Almost Periodic Differential Equations (Lecture Notes in Mathematics, 377)
Equations Differentielles a Points Singuliers Reguliers (Lecture Notes in Mathematics, 163) (French Edition)
Non-Oscillation Domains of Differential Equations with Two Parameters (Lecture Notes in Mathematics, 1338)
Lectures on n-Dimensional Quasiconformal Mappings (Lecture Notes in Mathematics, 229)
Stability of Unfoldings (Lecture Notes in Mathematics, 393)
Constructive Methods for Elliptic Equations (Lecture Notes in Mathematics, 365)