@article{JRAM_1986__367_152824,
     author = {Lucian Badescu},
     title = {Normal projective degenerations of rational and ruled surfaces.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {76--89},
     publisher = {mathdoc},
     volume = {367},
     year = {1986},
     zbl = {0604.14020},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1986__367_152824/}
}