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@article{CMH_1970__45_139438, author = {Hans Werner Schuster}, title = {Infinitesimale {Erweiterungen} komplexer {R\"aume.}}, journal = {Commentarii mathematici Helvetici}, pages = {265--286}, publisher = {mathdoc}, volume = {45}, year = {1970}, url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139438/} }
Hans Werner Schuster. Infinitesimale Erweiterungen komplexer Räume.. Commentarii mathematici Helvetici, Tome 45 (1970), pp. 265-286. http://geodesic.mathdoc.fr/item/CMH_1970__45_139438/