1. F. Alessio, M. L. Bertotti, P. Montecchiari
2. Homoclinic solutions of quasi periodic Hamiltonian systems;Bertotti;Differential Integral Equations,1995
3. A variational approach for homoclinics in almost periodic Hamiltonian systems;Bertotti;Comm. Appl. Nonlinear Anal.,1995
4. Multiplicity of homoclinic solutions for singular second order conservative systems;Bertotti;Proc. Royal Soc. Edinburgh Ser. A,1996
5. Libration motions of natural dynamical systems;Bolotin;Vestnik Moskov. Univ. Ser. I Mat. Mekh.,1978