1. Lectures on Hamiltonian Systems;Moser,1968
2. Theoreticheskaja Mekhanika;Markeev,1990
3. Perturbation Methods;Nayfeh,1973
4. Tochki Libracii v Nebesnoj Mekhanike i Kosmodinamike;Markeev,1978
5. Perturbation Methods in Non-Linear Systems;Giacaglia,1972