@article{DE_1968_4_10_a13,
     author = {I. V. Gel'man},
     title = {Stable solvable extensions of linear systems of partial differential operators with constant coefficients in a bounded region},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1910--1914},
     publisher = {mathdoc},
     volume = {4},
     number = {10},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_10_a13/}
}