@article{DAN_1960_130_6_a0,
     author = {A. A. Dezin},
     title = {Systems of the first order defined on a {Riemannian} manifold},
     journal = {Doklady Akademii Nauk},
     pages = {1183--1185},
     publisher = {mathdoc},
     volume = {130},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_6_a0/}
}