Numerical treatment of a nonlinear dynamical Hepatitis-B model: an evolutionary approach Muhammad Farman, Muhammad Farhan Tabassum, Parvaiz Ahmad Naik and Sana Akram Eur. Phys. J. Plus, 135 12 (2020) 941 Published online: 02 December 2020 DOI: 10.1140/epjp/s13360-020-00902-x