@article{GDZPPN002096242, title = {Universal Connections.}, journal = {Inventiones mathematicae}, volume = {56}, year = {1980}, pages = {59-66}, zbl = {0431.53028}, url = {http://dml.mathdoc.fr/item/GDZPPN002096242} }
Schlafly, Roger. Universal Connections.. Inventiones mathematicae, Tome 56 (1980) pp. 59-66. http://gdmltest.u-ga.fr/item/GDZPPN002096242/