![Difference Discrete Variational Principles, Euler–Lagrange Cohomology and Symplectic, Multisymplectic Structures I: Difference Discrete Variational Principle]()
Difference Discrete Variational Principles, Euler–Lagrange Cohomology and Symplectic, Multisymplectic Structures I: Difference Discrete Variational PrincipleHan-Ying, Guo; Yu-Qi, Li; Ke, Wu; Shi-Kun, Wang · Communications in Theoretical Physics · 2002