@article{MZM_1990_47_5_a19,
     author = {S. Yu. Dobrokhotov and O. L. Tolstova},
     title = {Application of conservation laws in asymptotic problems for equations with an operator-valued symbol},
     journal = {Matemati\v{c}eskie zametki},
     pages = {148--151},
     publisher = {mathdoc},
     volume = {47},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a19/}
}