@article{ZNSL_2014_422_a4,
     author = {A. I. Korol'kov and A. V. Shanin},
     title = {Diffraction by grating consisting of screens with different height: new equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {62--89},
     year = {2014},
     volume = {422},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2014_422_a4/}
}