Research on the discrete variational method for a Birkhoffian system
刘世兴, 花巍, 郭永新
Research on the discrete variational method for a Birkhoffian system
Liu Shi-Xing (刘世兴), Hua Wei (花巍), Guo Yong-Xin (郭永新)
中国物理B . 2014, (6): 64501 -064501 .  DOI: 10.1088/1674-1056/23/6/064501