@article{CMH_1987__62_140091,
     author = {Andrew J. Sommese and M. Beltrametti},
     title = {A criterion for a variety to be cone.},
     journal = {Commentarii mathematici Helvetici},
     pages = {417--422},
     publisher = {mathdoc},
     volume = {62},
     year = {1987},
     zbl = {0633.14028},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140091/}
}