Exact invariants and adiabatic invariants of the singular Lagrange system
陈向炜, 李彦敏
Exact invariants and adiabatic invariants of the singular Lagrange system
Chen Xiang-Wei (陈向炜), Li Yan-Min (李彦敏)
中国物理B . 2003, (9): 936 -939 .  DOI: 10.1088/1009-1963/12/9/302