@article{DAN_1988_299_1_a25,
     author = {A. V. Goncharsky and V. V. Stepanov},
     title = {Problems of the focusing of radiation in the {Fresnel}},
     journal = {Doklady Akademii Nauk},
     pages = {115--118},
     publisher = {mathdoc},
     volume = {299},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_299_1_a25/}
}