Error Bounds for Numerical Solutions of Ordinary Differential Equations. G.J. Cooper Numerische Mathematik
Single Step Methods for Linear Differential Equations. G.J. COOPER; E. GAL — 1967 Numerische Mathematik
Liapunov Functions and Error Bounds for Approximate Solutions of Ordinary Differential Equations. G.J. Cooper; F.C.P. Whitworth — 1978 Numerische Mathematik