G. N. B.  Chendjou, Nguenang, J. P., Trombettoni, A., Dauxois, T., Khomeriki, R., and Ruffo, S., ?Fermi-Pasta-Ulam chains with harmonic and anharmonic long-range interactions?, Communications in Nonlinear Science and Numerical Simulation, vol. 60, pp. 115-127, 2018.