Complex dynamics in the two spring-block model for earthquakes with fractional viscous dampingG. B. Tanekou, C. F. Fogang, F. B. Pelap, R. Kengne, T. F. Fozin and B. R. N. NbendjoEur. Phys. J. Plus, 135 7 (2020) 545DOI: https://doi.org/10.1140/epjp/s13360-020-00558-7