@article{IVM_1970_12_a5,
     author = {E. L. Makarova},
     title = {A~certain problem for a~nonlinear equation of mixed type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {47--52},
     publisher = {mathdoc},
     number = {12},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_12_a5/}
}