Addendum to the article: Polylogarithms in the field of omega (a root of a given cubic): Functional equations and ladders. L. Lewin; Xiao Hongnian; M. Abouzahra — 1988 Aequationes mathematicae
Polylogarithms in the field of omega (a root of given cubic): Functional equations and ladders. L. Abouzahra; L. Lewin; Xiao Hongnian — 1987 Aequationes mathematicae