On the time complexity of computer viruses. - Zhi-hong Zuo; Qingxin Zhu; Ming-Tian Zhou (IEEE Trans. Inf. Theory, 2005)

Infection, imitation and a hierarchy of computer viruses. - Zhi-hong Zuo; Qingxin Zhu; Ming-Tian Zhou (Comput. Secur., 2006)