Perturbation to Mei symmetry and adiabatic invariants for Hamilton systems
丁 宁, 方建会
Perturbation to Mei symmetry and adiabatic invariants for Hamilton systems
Ding Ning(丁宁) and Fang Jian-Hui(方建会)
中国物理B . 2008, (5): 1550 -1553 .  DOI: 10.1088/1674-1056/17/5/003