@incollection{AST_1976__32-33__141_0,
     author = {Grauert, Hans},
     title = {\"Uber die {Deformation} von {Pseudogruppenstrukturen}},
     booktitle = {Colloque analyse et topologie},
     series = {Ast\'erisque},
     pages = {141--150},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {32-33},
     year = {1976},
     mrnumber = {404694},
     zbl = {0332.32015},
     language = {de},
     url = {http://archive.numdam.org/item/AST_1976__32-33__141_0/}
}