@article{VMUMM_1987_2_a6,
     author = {A. A. Lokshin and E. A. Sagomonyan},
     title = {On the propagation of a nonlinear spherical wave},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {32--35},
     publisher = {mathdoc},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_2_a6/}
}