Ignatov, Yu. A. Roots of unity as nonfree points of the complex plane. (English) Zbl 0449.20043 Math. Notes 27, 398-399 (1980). MSC: 20F05 20G20 20H20 20E05 PDFBibTeX XMLCite \textit{Yu. A. Ignatov}, Math. Notes 27, 398--399 (1980; Zbl 0449.20043) Full Text: DOI
Ignatov, Yu. A. Groups of linear fractional transformations generated by three elements. (English) Zbl 0445.20024 Math. Notes 27, 250-253 (1980). MSC: 20G20 20F05 20E05 20E07 PDFBibTeX XMLCite \textit{Yu. A. Ignatov}, Math. Notes 27, 250--253 (1980; Zbl 0445.20024) Full Text: DOI