@article{ZNSL_2003_297_a10,
     author = {N. G. Kuznetsov and O. V. Motygin},
     title = {The {Steklov} problem in a half-plane: the dependence of eigenvalues on a~piecewise-constant coefficient},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {162--190},
     year = {2003},
     volume = {297},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_297_a10/}
}