@article{UZKU_1962_122_3_a1,
     author = {V. I. Zhegalov},
     title = {Some boundary-value problems for a~system of second-order equations of mixed type},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {17--29},
     publisher = {mathdoc},
     volume = {122},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1962_122_3_a1/}
}