Pattern formations in nonlinear dynamics of hepatitis B virusB. Tamko Mbopda, S. Issa, S. Abdoulkary, R. Guiem and H. P. Ekobena FoudaEur. Phys. J. Plus, 136 5 (2021) 586DOI: https://doi.org/10.1140/epjp/s13360-021-01569-8