@article{DE_2003_39_4_a14,
     author = {E. K. Makarov},
     title = {The {Characteristic} {Sets} of {Multidimensional} {Equations} with {Respect} to a {Polyhedral} {Cone} {Can} {Be} {Nonclosed}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {560--562},
     publisher = {mathdoc},
     volume = {39},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_4_a14/}
}