Dr. Qutaiba N. Nayef AL-Qazaz, O. R. J. “Comparison of Doubly and Intelligent Threshold Geometric Stochastic Process in the Study of Covid-19 Virus Infection”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 6, May 2021, pp. 3293-04, doi:10.17762/turcomat.v12i6.7114.