@article{DAN_1961_139_2_a11,
     author = {M. L. Rasulov},
     title = {Conditions for the correctness of one-dimensional mixed problems},
     journal = {Doklady Akademii Nauk},
     pages = {305--308},
     publisher = {mathdoc},
     volume = {139},
     number = {2},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_2_a11/}
}