@article{ZNSL_2011_393_a15,
     author = {A. B. Plachenov},
     title = {Tilted nonparaxial beams and packets for the wave equation with two spatial variables},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {224--233},
     publisher = {mathdoc},
     volume = {393},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_393_a15/}
}