@article{PMIHES_2006__104__1_0,
     author = {Januszkiewicz, Tadeusz and \'Swi\k{a}tkowski, Jacek},
     title = {Simplicial nonpositive curvature},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {1--85},
     publisher = {Springer},
     volume = {104},
     year = {2006},
     doi = {10.1007/s10240-006-0038-5},
     mrnumber = {2264834},
     language = {en},
     url = {http://www.numdam.org/articles/10.1007/s10240-006-0038-5/}
}