Pattern formations in nonlinear dynamics of hepatitis B virus B. Tamko Mbopda, S. Issa, S. Abdoulkary, R. Guiem and H. P. Ekobena Fouda Eur. Phys. J. Plus, 136 5 (2021) 586 Published online: 27 May 2021 DOI: 10.1140/epjp/s13360-021-01569-8