Z.-H. Ren, Y.-H. Xu, Y.-L. Han, N. Zhang, and B.-C. Wen, “Influence of Systematic Coupling Stiffness Parameter on Coupling Duffing System Lag Self-synchronization Characteristic”, JAND, vol. 4, no. 3, pp. 229–237, Aug. 2026, doi: 10.5890/JAND.2015.09.003.