Semileptonic $$B_c$$ meson decays to S-wave charmonium states Sonali Patnaik, Lopamudra Nayak, P. C. Dash, Susmita Kar and N. Barik Eur. Phys. J. Plus, 135 11 (2020) 936 Published online: 25 November 2020 DOI: 10.1140/epjp/s13360-020-00898-4