Jing Wang, Hua Wu, Da-jun Zhang, “Solutions of the nonlocal (2+1)-D breaking solitons hierarchy and the negative order AKNS hierarchy”, Commun. Theor. Phys., 72:4 (2020), 045002
Zhao Song-Lin, Zhang Da-Jun, Ji Jie, “Exact Solutions for Two Equation Hierarchies”, Chinese Phys Lett, 27:2 (2010), 020201
Zhenyun Qin, Ruguang Zhou, “A (2+1)-dimensional breaking soliton equation associated with the Kaup–Newell soliton hierarchy”, Chaos, Solitons & Fractals, 21:2 (2004), 311