@article{AA_2008_20_2_a7,
     author = {S. Yu. Favorov},
     title = {Lagrange's problem on mean motion},
     journal = {Algebra i analiz},
     pages = {218--225},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2008_20_2_a7/}
}