Shyam S.N. Perera,  Controllability of Efficiency of Antiviral Therapy in Hepatitis B Virus Infections .   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2009, vol. 35(11). 1035 - 1039
    [viewed 11 April 2021]. Available from: https://publications.waset.org/pdf/8023.