@article{MZ_1953__58_169350,
     author = {Richard L. Ingraham},
     title = {Linear {Connection} in {Spin-Collineation} {Space.}},
     journal = {Mathematische Zeitschrift},
     pages = {265--271},
     publisher = {mathdoc},
     volume = {58},
     year = {1953},
     zbl = {0051.39801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1953__58_169350/}
}