Godinho, Leonor; Sousa-Dias, M. E. The fundamental group of \(S^1\)-manifolds. (English) Zbl 1207.53084 Can. J. Math. 62, No. 5, 1082-1098 (2010); erratum ibid. 65, No. 3, 553-558 (2013). Reviewer: Ivan Ivanšić (Zagreb) MSC: 53D20 55Q05 37J10 PDFBibTeX XMLCite \textit{L. Godinho} and \textit{M. E. Sousa-Dias}, Can. J. Math. 62, No. 5, 1082--1098 (2010; Zbl 1207.53084) Full Text: DOI arXiv
Cushman, Richard; Śniatycki, Jȩdrzej Differential structure of orbit spaces. (English) Zbl 1102.53301 Can. J. Math. 53, No. 4, 715-755 (2001); erratum ibid. 55, No. 2, 247 (2003). MSC: 53D20 37J15 58A40 58D19 70H33 PDFBibTeX XMLCite \textit{R. Cushman} and \textit{J. Śniatycki}, Can. J. Math. 53, No. 4, 715--755 (2003; Zbl 1102.53301) Full Text: DOI