L...-Convergence of Collocation and Galerkin Approximations to Linear Two-point Parabolic Systems. J.C. Cavendish, C.A. Hall (1974) Aequationes mathematicae
Linearisierung formal-biholomorpher Abbildungen und Interationsprobleme. Ludwig Reich, Jens Schwaiger (1980) Aequationes mathematicae