@article{ZNSL_1987_165_a13,
     author = {M. M. Popov},
     title = {Summation of space-time {Gaussian} beams in problems of propagation of wave packets},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {143--158},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a13/}
}