@article{IVM_1991_8_a1,
     author = {V. N. Aref'ev},
     title = {The smoothness of generalized solutions of some equations of mixed type with discontinuous coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {8--13},
     publisher = {mathdoc},
     number = {8},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_8_a1/}
}