@article{DAN_1993_328_6_a10,
     author = {A. A. Shvartsburg},
     title = {Geocentric halo orbits for solar sails with non-perfect reflection},
     journal = {Doklady Akademii Nauk},
     pages = {686--690},
     year = {1993},
     volume = {328},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_328_6_a10/}
}