@article{DAN_1981_260_2_a6,
     author = {A. A. Melikyan},
     title = {The {Cauchy} problem with unknown boundary for a first-order partial differential equation},
     journal = {Doklady Akademii Nauk},
     pages = {288--292},
     publisher = {mathdoc},
     volume = {260},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_2_a6/}
}