Nonlinear tunneling of solitons in a variable coefficients nonlinear Schrödinger equation with -symmetric Rosen–Morse potentialK. Manikandan, J. B. Sudharsan and M. SenthilvelanEur. Phys. J. B, 94 6 (2021) 122DOI: https://doi.org/10.1140/epjb/s10051-021-00123-w