@incollection{SB_1976-1977__19__167_0, author = {Hirsch, Francis}, title = {Op\'erateurs carr\'e du champ}, booktitle = {S\'eminaire Bourbaki : vol. 1976/77, expos\'es 489-506}, author = {Collectif}, series = {S\'eminaire Bourbaki}, note = {talk:501}, publisher = {Springer-Verlag}, number = {19}, year = {1978}, zbl = {0389.31005}, mrnumber = {521767}, language = {fr}, url = {http://archive.numdam.org/item/SB_1976-1977__19__167_0/} }