The exact order of convergence for finite difference approximations to ordinary boundary value problems
In: Mathematics of computation, Jg. 33 H. 148, S. 1213-1228
On discretizations of bifurcation problems
In: Bifurcation problems and their numerical solution: Workshop on Bifurcation Problems and Their Numerical Solution Dortmund, January 15 - 17, 1980, Jg. 54, S. 46-73