Francis, George K.; Morin, Bernard Arnold Shapiro’s eversion of the sphere. (English) Zbl 0456.57008 Math. Intell. 2, 200-203 (1980). MSC: 57R42 01A25 01A70 PDFBibTeX XMLCite \textit{G. K. Francis} and \textit{B. Morin}, Math. Intell. 2, 200--203 (1980; Zbl 0456.57008) Full Text: DOI
Francis, George K. Branched and folded parametrizations of the sphere. (English) Zbl 0276.57012 Bull. Am. Math. Soc. 80, 72-76 (1974). MSC: 57R45 30F20 57M10 58C25 PDFBibTeX XMLCite \textit{G. K. Francis}, Bull. Am. Math. Soc. 80, 72--76 (1974; Zbl 0276.57012) Full Text: DOI
Francis, George K. Spherical curves that bound immersed discs. (English) Zbl 0281.57020 Proc. Am. Math. Soc. 41, 87-93 (1973). MSC: 57R40 30F20 57M10 55S35 57N70 PDFBibTeX XMLCite \textit{G. K. Francis}, Proc. Am. Math. Soc. 41, 87--93 (1973; Zbl 0281.57020) Full Text: DOI
Francis, G. K. The folded ribbon theorem. A contribution to the study of immersed circles. (English) Zbl 0182.26404 Trans. Am. Math. Soc. 141, 271-303 (1969). PDFBibTeX XMLCite \textit{G. K. Francis}, Trans. Am. Math. Soc. 141, 271--303 (1969; Zbl 0182.26404) Full Text: DOI
Francis, George K. The folded ribbon theorem for regular closed curves in the plane. (English) Zbl 0157.54502 Bull. Am. Math. Soc. 74, 264-267 (1968). PDFBibTeX XMLCite \textit{G. K. Francis}, Bull. Am. Math. Soc. 74, 264--267 (1968; Zbl 0157.54502) Full Text: DOI