Fundamental solutions for meromorphic linear difference equations in the complex plane, and related problems. C. Praagman — 1986 Journal für die reine und angewandte Mathematik
Roots, iterations and logarithms of formal automorphisms. C. Praagman — 1987 Aequationes mathematicae
Roots and logarithms of automorphisms of complete local rings. C. Praagman — 1987 Aequationes mathematicae
Iterations and logarithms of formal automorphisms. (Short Communication). C. Praagman — 1985 Aequationes mathematicae