El-Ghoul, M.; El-Ahmady, A. E.; Abu-Saleem, M. Folding on the Cartesian product of manifolds and their fundamental group. (English) Zbl 1154.57300 Appl. Sci. 9, 86-91 (2007). MSC: 57N99 Topological manifolds 57M05 Fundamental group, presentations, free differential calculus PDFBibTeX XMLCite \textit{M. El-Ghoul} et al., Appl. Sci. 9, 86--91 (2007; Zbl 1154.57300) Full Text: EuDML