1. Topological obstacles to the integrability of natural mechanical systems;Kozlov;Dokl. AN SSSR,1979
2. New methods of celestial mechanics;Poincaré,1971
3. Uber die algebraishen Integrale des restringerten Dreikörperproblems;Siegel;Trans. Amer. Math. Soc.,1936
4. Final motions in the problem of three bodies and symbolic dynamics;Alekseev;Uspekhi Matem. Nauk,1981
5. The Riemann Surfaces;Forster,1980