@article{ZNSL_1998_250_a7,
     author = {V. V. Zalipaev},
     title = {Plane wave diffraction by a step discontinuity in an impedamce plane},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {97--108},
     publisher = {mathdoc},
     volume = {250},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1998_250_a7/}
}