@article{ZVMMF_1980_20_2_a25,
     author = {S. N. Medvedev},
     title = {Problem of integral geometry for a family of curves in a circular annulus},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {531--538},
     year = {1980},
     volume = {20},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1980_20_2_a25/}
}