@article{FAA_1981_15_3_a4,
     author = {S. P. Novikov and I. Shmel'tser},
     title = {Periodic solutions of {Kirchhoff's} equations for the free motion of a rigid body in a fluid and the extended theory of {Lyusternik{\textendash}Shnirel'man{\textendash}Morse} {(LSM).} {I}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {54--66},
     year = {1981},
     volume = {15},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1981_15_3_a4/}
}