On S. Gołąb's characterization of the anharmonic ratio Bogdan Choczewski — 1981 Annales Polonici Mathematici
A special solution of the inhomogeneous Schröder equation. Choczewski, Bogdan — 1998 Mathematica Pannonica
Cauchy's equation on the graph of an involution. Choczewski, Bogdan; Corovei, Ilie; Rusu, Constantin — 1994 Mathematica Pannonica