@article{DAN_1990_313_3_a1,
     author = {K. Kh. Boimatov},
     title = {Multidimensional systems of differential equations of composite type with nonsmooth coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {525--528},
     publisher = {mathdoc},
     volume = {313},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a1/}
}