Modulational instability in transversely connected nonlinear pendulum pairs A. Kamdoum Kuitche, A. B. Togueu Motcheyo, Thomas Kanaa and C. Tchawoua Eur. Phys. J. Plus, 138 2 (2023) 142 Published online: 09 February 2023 DOI: 10.1140/epjp/s13360-023-03761-4