Zhang, Yufeng, et al. “An (2+1)-Dimensional Expanding Model of the Davey-Stewartson Hierarchy As Well As Its Hamiltonian Structure”. Discontinuity, Nonlinearity, and Complexity, vol. 3, no. 4, Aug. 2026, pp. 427-34, https://doi.org/10.5890/DNC.2014.12.005.