Orbihedra of nonpositive curvature
Publications Mathématiques de l'IHÉS, Tome 82 (1995), pp. 169-209. 
@article{PMIHES_1995__82__169_0,
     author = {Ballmann, Werner and Brin, Michael},
     title = {Orbihedra of nonpositive curvature},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {169--209},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {82},
     year = {1995},
     mrnumber = {97i:53049},
     zbl = {0866.53029},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1995__82__169_0/}
}
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Ballmann, Werner; Brin, Michael. Orbihedra of nonpositive curvature. Publications Mathématiques de l'IHÉS, Tome 82 (1995), pp. 169-209. http://www.numdam.org/item/PMIHES_1995__82__169_0/

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