Modulational instabilities and chaotic-like behaviors in repulsive lattices J. B. Atanekeng Sonkeng, Fabien II Ndzana, Saidou Abdoulkary and Alidou Mohamadou Eur. Phys. J. Plus, 136 2 (2021) 158 Published online: 01 February 2021 DOI: 10.1140/epjp/s13360-020-01069-1