On the convergence of the finite difference method for nonlinear ordinary boundary value problems
In: Constructive methods for nonlinear boundary value problems and nonlinear oscillations: conference at the Oberwolfach Mathematical Research Institute, Black Forest, November 19 - 25, 1978, Vol. 48, page 9-191978
Zur Anwendung der Theorie über den Spektralradius linearer, streng-monotoner Operatoren
In: Numerische Behandlung von Eigenwertaufgaben, Vol. 24, page 23-311974