@article{IVM_1974_5_a17,
     author = {A. E. Liber},
     title = {The invariant normalization of a~certain class of surfaces of a~projective space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {144--147},
     year = {1974},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_5_a17/}
}