@article{DAN_1967_172_3_a2,
     author = {B. R. Vainberg and V. V. Grushin},
     title = {Uniformly non-elliptic systems of singular integro-differential equations on compact manifolds},
     journal = {Doklady Akademii Nauk},
     pages = {518--520},
     publisher = {mathdoc},
     volume = {172},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_3_a2/}
}