@article{KUKZ_1984_21_21_a3,
     author = {L. K. Astaf'eva},
     title = {A nonlinear boundary value problem for an equation of mixed type},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {32--39},
     publisher = {mathdoc},
     volume = {21},
     number = {21},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1984_21_21_a3/}
}