@article{ZNSL_2001_275_a7,
     author = {A. P. Kiselev},
     title = {Relatively undistorted waves. {New} examples},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {100--103},
     publisher = {mathdoc},
     volume = {275},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2001_275_a7/}
}