Geodesic
The existence of periodic motions and motions of a special form for Hamiltonian systems with small parameter
Doklady Akademii Nauk, Tome 186 (1969) no. 4, pp. 757-760 
V. I. Derguzov. The existence of periodic motions and motions of a special form for Hamiltonian systems with small parameter. Doklady Akademii Nauk, Tome 186 (1969) no. 4, pp. 757-760. http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a4/
@article{DAN_1969_186_4_a4,
     author = {V. I. Derguzov},
     title = {The existence of periodic motions and motions of a special form for {Hamiltonian} systems with small parameter},
     journal = {Doklady Akademii Nauk},
     pages = {757--760},
     year = {1969},
     volume = {186},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a4/}
}
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