@article{ZNSL_1987_165_a6,
     author = {N. S. Grigor'eva},
     title = {Doppler effect in the motion of a source and a refractive surface},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {52--58},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a6/}
}