@article{DAN_1980_252_3_a11,
     author = {S. V. Uspenskii and G. V. Demidenko},
     title = {On mixed boundary-value problems for a class of equations unsolved with respect to the highest derivative},
     journal = {Doklady Akademii Nauk},
     pages = {560--562},
     publisher = {mathdoc},
     volume = {252},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_3_a11/}
}