Ponomarev С. Б., Romanov К. А., and Abashev А. М. “Problem of HIV Infection Spread Modeling”. Vestnik IzhGTU Imeni M.T. Kalashnikova, no. 2, June 2012, pp. 145-7, https://izdat.istu.ru/index.php/vestnik/article/view/2162.