@article{DE_1970_6_11_a13,
     author = {S. G. Krein and V. B. Osipov},
     title = {Ljapunov functions and {Cauchy} problems for certain systems of partial differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2053--2061},
     publisher = {mathdoc},
     volume = {6},
     number = {11},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_11_a13/}
}