“…The basic conceptual tools in understanding the epidemic spreading and the related effective strategies for epidemic controlling should be the epidemiological models [17,18]. Among the numerous possible models, the most investigated and classical models are SI model [19,20], SIS model [21,22,23,24,25] and SIR model [26,27,28,29], which can approximately describe the spreading of real viruses such as HIV, encephalitis, influenza virus in biological networks; computer virus, trash mail in technological networks; and even gossip in social networks.…”