On existence of degenerate circle-preserving maps
The author constructs a degenerate circle-preserving map, which shows that the conjecture recently raised by \textit{B. Li} and \textit{Y. Wang} [Sci. China, Ser. A 48, Suppl., 195--205 (2005; Zbl 1113.30036)] is not true.
scientific article; zbMATH DE number 5172997