@article{IM_1980__59_142729,
     author = {Roger Schlafly},
     title = {Universal {Connections.}},
     journal = {Inventiones mathematicae},
     pages = {59--66},
     publisher = {mathdoc},
     volume = {59},
     year = {1980},
     zbl = {0431.53028},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__59_142729/}
}