@article{ZNSL_1991_195_a4,
     author = {V. V. Zalipaev and M. M. Popov},
     title = {On completeness of asymptotic formulae for amplitudes of the plane waves diffracted by a smooth periodic boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--47},
     year = {1991},
     volume = {195},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a4/}
}