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[4] World Health Organization (WHO) (2020) Novel Corona Virus (2019-nCOV) Situation Report-2.
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[7] https://www.ecdc.europa.eu/en/novel-coronavirus-china/questions-answers
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[14] Least Squares Analysis and Curve Fitting, by Don C. Warrington. Department of Civil and Mechanical Engineering University of Tennessee at Chattanooga. Fluid Mechanics Laboratory ENCE3070L.
[15] https://en.wikipedia.org/wiki/Curve_fitting
[16] https://statisticsbyjim.com/regression/curve-fitting-linear-nonlinear-regression
[17] https://en.wikipedia.org/wiki/Least_squares
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[19] Flowers, B.H. (2009) An Introduction to Numerical Methods in C++ Indian Edition. Oxford University Press, Oxford, 293-294.