@article{ZNSL_1971_22_a14,
     author = {V. S. Buslaev},
     title = {Potential theory and geometrical optic},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {175--180},
     publisher = {mathdoc},
     volume = {22},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_22_a14/}
}