@article{IVM_1987_10_a3,
     author = {S. N. Samborskiǐ and M. A. Fel'dman},
     title = {Connected systems of partial differential equations (initial-boundary value problems and propagation of singularities)},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {14--23},
     publisher = {mathdoc},
     number = {10},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_10_a3/}
}