@article{ZNSL_1981_117_a0,
     author = {V. M. Babich and V. V. Ulin},
     title = {Complex space-time ray method and {\textquotedblleft}quasifotons{\textquotedblright}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--12},
     year = {1981},
     volume = {117},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a0/}
}