@article{DE_2003_39_3_a2,
     author = {N. A. Izobov and E. N. Krupchik},
     title = {A {Joint} {Description} of the {Boundary} {Exponent} {Sets} of a {Solution} of a {Linear} {Pfaff} {System:} {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {308--319},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_3_a2/}
}