@article{DE_1998_34_12_a1,
     author = {N. A. Izobov and A. S. Platonov},
     title = {Construction of a linear {Pfaff} equation with arbitrarily given characteristics and lower characteristic sets},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1596--1603},
     publisher = {mathdoc},
     volume = {34},
     number = {12},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_12_a1/}
}