1. West, D.B.: An Introduction to Graph Theory. Prentice-Hall, Pearson Edison India (1995)
2. Giulia Giordano, G., Blanchini, F., Bruno, R., Colaneri, P., Di Filippo, A., Di Matteo, A., Colaneri, M.: A SIDARTHE model of COVID-19 epidemic in Italy. arXiv preprint arXiv:2003.09861 (2020)
3. Akhtar, I.H.: Understanding the CoVID-19 pandemic curve through statistical approach. Cold Spring Harbor Laboratory (2020)
4. WHO: Novel Corona virus (2019-nCoV) Situation Report - 39. 2020 [cited 2020 April 20]; Available from: https://www.who.int/docs/defaultsource/coronaviruse/situationreports/20200228-sitrep-39-covid-19.pdf?sfvrsn=5bbf3e7d_2
5. Chung, F.R.K., Lu, L.: Complex graphs and networks, CBMS regional conference series in mathematics. Am. Mathe. Soc. 10 (2006)