1. On the existence of closed geodesics on noncompact Riemannian manifolds Duke;Benci;Math J,1992
2. and Convexity of domains of Rie - mannian manifolds Global to appear;Bartolo;Anal Geom
3. lo Variational problems on compact manifolds Closed geodesic on non - compact Riemannian manifolds ll Algebraic Topology Cambridge;Lyusternik;Akad Nauk SSSR,1951
4. Periodic solutions with prescribed energy on non - complete Riemannian manifolds;Mirenghi;Math Anal Appl,1996
5. Closed geodesics in Riemannian manifolds with convex bounday Edinburgh Sect;Candela;Roy,1994