André Haefliger, Differentiable Embeddings of in for , Annals of Mathematics Second Series, Vol. 83, No. 3 (May, 1966), pp. 402-436 (jstor:1970475)
M. Bridson and A. Haefliger, 1999, Metric Spaces of Non-Positive Curvature, number 31 in Grundlehren der Math. Wiss, Springer.
Introducing Haefliger groupoids:
On orbifolds:
On orbispaces:
André Haefliger, Groupoides d’holonomie et classifiants, Astérisque no. 116 (1984), p. 70-97 (numdam:AST_1984__116__70_0)
André Haefliger, Orbi-Espaces, In: E. Ghys, P. de la Harpe (eds.), Sur les Groupes Hyperboliques d’après Mikhael Gromov, Progress in Mathematics, vol 83. Birkhäuser 1990 (doi:10.1007/978-1-4684-9167-8_11)
André Haefliger, Complexes of Groups and Orbihedra, in: E. Ghys, A. Haefliger, A Verjovsky (eds.), Proceedings of the Group Theory from a Geometrical Viewpoint, ICTP, Trieste, Italy , 26 March – 6 April 1990_, World Scientific 1991 (doi:10.1142/1235)
On mapping stacks between orbifolds:
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