@article{ZNSL_1975_51_a1,
     author = {V. M. Babich and N. S. Grigor'ev},
     title = {Asymptotical properties of solutions of some three-dimensional problems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {20--77},
     year = {1975},
     volume = {51},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1975_51_a1/}
}