@article{DAN_1965_161_5_a7,
     author = {S. P. Khairullina},
     title = {On certain {Cauchy} problems with initial data on a line of degeneracy},
     journal = {Doklady Akademii Nauk},
     pages = {1027--1029},
     publisher = {mathdoc},
     volume = {161},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_5_a7/}
}