@article{DAN_1966_171_1_a5,
     author = {Ya. I. Zhitomirskii},
     title = {Exact classes of uniqueness of solution of the {Cauchy} problem for equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {29--32},
     publisher = {mathdoc},
     volume = {171},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_171_1_a5/}
}