@Incollection{, title = {Le retour de la g{\'e}om{\'e}trie}, author = {Volkert, Klaus}, booktitle = {G{\'e}om{\'e}trie au XXe si{\`e}cle}, year = {2005}, publisher = {Hermann, Paris}, pages = {150{\textendash}162}, isbn = {978-2-7056-6545-6} }