@article{DAN_1981_257_4_a14,
     author = {A. I. Yanushauskas},
     title = {On the well-posed property of boundary value problems for multidimensional equations of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {834--836},
     publisher = {mathdoc},
     volume = {257},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a14/}
}