@article{BSMF_1961__89__461_0,
     author = {Borel, Armand and Haefliger, Andre},
     title = {La classe d'homologie fondamentale d'un espace analytique},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {461--513},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {89},
     year = {1961},
     doi = {10.24033/bsmf.1571},
     mrnumber = {26 #6990},
     zbl = {0102.38502},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.1571/}
}