@article{INTG_1974_5_a5,
     author = {V. I. Bliznikas and Z. Yu. Lupeikis},
     title = {The geometry of certain systems of partial differential equations},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {135--168},
     publisher = {mathdoc},
     volume = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1974_5_a5/}
}