@article{DE_1986_22_9_a28,
     author = {B. A. Shcherbakov},
     title = {Singular points of two-dimensional linear total differential equations with constant coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1633--1636},
     publisher = {mathdoc},
     volume = {22},
     number = {9},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a28/}
}