Über die näherungsweise Lösung nichtlinearer Integralgleichungen. H. Amann — 1972 Numerische Mathematik
Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations H. Amann; E. Zehnder — 1980 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
Elliptic Equations with Noninvertible Fredholm Linear Part and Bounded Nonlinearities. H. Amann; A. Ambrosett; G. Mancini — 1978 Mathematische Zeitschrift
A Fujita-type theorem for the Laplace equation with a dynamical boundary condition. Amann, H.; Fila, M. — 1997 Acta Mathematica Universitatis Comenianae. New Series