Martin Schechter

Critical Point Theory

Fredholm Operators And The Essential Spectrum

Critical Point Theory : Sandwich And Linking Systems

Solving Linear Partial Differential Equations

An Introduction To Nonlinear Analysis

Linking Methods In Critical Point Theory

Linking Methods In Critical Point Theory

Operator Methods In Quantum Mechanics

Minimax Systems And Critical Point Theory

Spectra Of Partial Differential Operators (North-Holland Series In Applied Mathematics And Mechanics, V. 14)