6533b884fe1ef96bd12de812

RESEARCH PRODUCT

MR2086063: Wu, Xian Saddle point characterization and multiplicity of periodic solutions of non-autonomous second-order systems. Nonlinear Anal. 58 (2004), no. 7-8, 899--907.

Maria Letizia Bertotti

subject

http://hdl.handle.net/10447/6761