Wave function approach to the off-shell T-matrix for the Deng–Fan potential Biswanath Swain, Dibakar Naik and Ujjwal Laha Eur. Phys. J. Plus, 139 10 (2024) 931 Published online: 24 October 2024 DOI: 10.1140/epjp/s13360-024-05748-1