@article{MZ_1932__35_168377,
     author = {J. H. 0., Whitehead},
     title = {Affine spaces of paths which are symmetrie about each point},
     journal = {Mathematische Zeitschrift},
     pages = {644--659},
     publisher = {mathdoc},
     volume = {35},
     year = {1932},
     zbl = {0004.41801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1932__35_168377/}
}