@article{SM_1986_54_1_a5,
     author = {F. L. Zak},
     title = {Severi varieties},
     journal = {Sbornik. Mathematics},
     pages = {113--127},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_54_1_a5/}
}