中国科学院数学与系统科学研究院期刊网
AMS
Indices and Stability of the Lagrangian System on Riemannian Manifold
Gao Sheng ZHU
Acta Mathematica Sinica . 2021, (4): 565 -580 .  DOI: 10.1007/s10114-020-9311-7