@article{JRAM_1990__407_153233,
     author = {F. Campana and Th. Peternell},
     title = {Algebraicity of the ample cone of projective varieties.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {160--166},
     year = {1990},
     volume = {407},
     zbl = {0728.14004},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__407_153233/}
}