Monoatomic chain: modulational instability and exact traveling wave solutions Eric Tala-Tebue, Guy Roger Deffo, Serge Bruno Yamgoue, Aurélien Kenfack-Jiotsa and Francois Beceau Pelap Eur. Phys. J. Plus, 135 9 (2020) 715 Published online: 11 September 2020 DOI: 10.1140/epjp/s13360-020-00624-0