@incollection{AST_1978__59-60__43_0,
     author = {Golubitsky, Martin and Tischler, David},
     title = {A survey on the singularities and stability of differential forms},
     booktitle = {Journ\'ees singuli\`eres de Dijon},
     series = {Ast\'erisque},
     pages = {43--82},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {59-60},
     year = {1978},
     zbl = {0412.58002},
     mrnumber = {542731},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1978__59-60__43_0/}
}