%0 Journal Article %A A. A. Shvartsburg %T Geocentric halo orbits for solar sails with non-perfect reflection %J Doklady Akademii Nauk %D 1993 %P 686-690 %V 328 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1993_328_6_a10/ %G ru %F DAN_1993_328_6_a10