@incollection{SB_1960-1961__6__277_0,
     author = {Lang, Serge},
     title = {L'\'equivalence homotopique tangentielle},
     booktitle = {S\'eminaire Bourbaki : ann\'ees 1960/61, expos\'es 205-222},
     series = {S\'eminaire Bourbaki},
     note = {talk:222},
     pages = {277--286},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {6},
     year = {1961},
     mrnumber = {1611826},
     zbl = {0116.40202},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1960-1961__6__277_0/}
}