@article{ZNSL_1988_173_a6,
     author = {A. P. Katchalov},
     title = {Two-parameter asymptotic formulas for space-time {Gaussian} beams in an elastic media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {87--95},
     publisher = {mathdoc},
     volume = {173},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_173_a6/}
}