Multi-symplectic variational integrators for nonlinear Schrödinger equations with variable coefficients
Liao Cui-Cui1, †, 
, Cui Jin-Chao1, Liang Jiu-Zhen2, Ding Xiao-Hua3
, Cui Jin-Chao1, Liang Jiu-Zhen2, Ding Xiao-Hua3 Four adjacent squares with a common vertex
