@article{DAN_1991_321_1_a11,
     author = {N. I. Ostrosablin},
     title = {On the matrix of coefficients in equations of the linear theory of},
     journal = {Doklady Akademii Nauk},
     pages = {63--65},
     publisher = {mathdoc},
     volume = {321},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_1_a11/}
}