@Incollection{, title = {The early history of Poincar{\'e}{\textquoteright}s conjecture}, series = {Publ. Henri-Poincar{\'e}-Arch.}, author = {Volkert, Klaus}, booktitle = {Henri Poincar{\'e}: science et philosophie (Nancy, 1994)}, year = {1996}, publisher = {Akademie Verlag, Berlin}, pages = {241{\textendash}250, 580} }