Lie symmetries and conserved quantities based on the variational integrators for the nonconservative Hamiltonian systems
XIA Lili, GUO Zhongjin, ZHANG Wei
Journal of Hebei University (Natural Science Edition) . 2019, (1): 6 -10 .  DOI: 10.3969/j.issn.1000-1565.2019.01.002