@article{SM_1999_190_6_a5,
     author = {V. M. Petrogradsky},
     title = {On numerical characteristics of subvarieties for three varieties of {Lie} algebras},
     journal = {Sbornik. Mathematics},
     pages = {887--902},
     year = {1999},
     volume = {190},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_6_a5/}
}