Delayed complex cubic-quintic Ginzburg–Landau equation in the spring block model of earthquake Innocent A. Mofor, G. B. Tanekou, D. Afungchui and M. Motchongom Tingue Eur. Phys. J. Plus, 140 7 (2025) 670 Published online: 17 July 2025 DOI: 10.1140/epjp/s13360-025-06573-w