@article{DAN_1964_158_3_a20,
     author = {K. S. Shifrin and A. Ya. Perel'man},
     title = {Reversion of the indicatrix for ``soft'' particles},
     journal = {Doklady Akademii Nauk},
     pages = {578--581},
     publisher = {mathdoc},
     volume = {158},
     number = {3},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_3_a20/}
}