@article{GDZPPN002373793, title = {Affine spaces of paths which are symmetrie about each point}, journal = {Mathematische Zeitschrift}, volume = {34}, year = {1932}, pages = {644-659}, zbl = {0004.41801}, url = {http://dml.mathdoc.fr/item/GDZPPN002373793} }
Whitehead, J. H. 0.,. Affine spaces of paths which are symmetrie about each point. Mathematische Zeitschrift, Tome 34 (1932) pp. 644-659. http://gdmltest.u-ga.fr/item/GDZPPN002373793/