{{Cite journal| doi = 10.1109/ACCESS.2021.3085240| volume = 9| pages = 80692–80702| last1 = Sapkota| first1 = N.| last2 = Karwowski| first2 = W.| last3 = Davahli| first3 = M.R.| last4 = Al-Juaid| first4 = A.| last5 = Taiar| first5 = R.| last6 = Murata| first6 = A.| last7 = Wrobel| first7 = G.| last8 = Marek| first8 = T.| title = The Chaotic Behavior of the Spread of Infection during the COVID-19 Pandemic in the United States and Globally| journal = IEEE Access| date = 2021}}