@article{IVM_1974_7_a4,
     author = {T. H. Kopytina},
     title = {Nets with a~fixed harmonic plane in three-dimensional projective space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {34--41},
     publisher = {mathdoc},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_7_a4/}
}