Quasi-periodic Solutions for One-Dimensional Nonlinear Lattice Schrödinger Equation with Tangent Potential. - Jiansheng Geng; Zhiyan Zhao (SIAM J. Math. Anal., 2013)

Quasi-Periodic Breathers in Granular Chains with Hertzian Contact Potential. - Chuanfang Ge; Jiansheng Geng; Yingfei Yi (J. Nonlinear Sci., 2023)