@article{DE_1999_35_6_a3,
     author = {N. A. Izobov},
     title = {On time sequences that realize characteristic and lower characteristic vectors of solutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {738--744},
     publisher = {mathdoc},
     volume = {35},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_6_a3/}
}