M. NANDAGOPAL, A. BALAKRISHNAN, and C. PADHIAR, “TRINITY OF SEVERE ACUTE RESPIRATORY SYNDROME CORONAVIRUS-2: ORIGIN, GENOTYPE, PHENOTYPE, AND IMMUNE RESPONSE IN CORONAVIRUS DISEASE-2019”, Asian J Pharm Clin Res, vol. 14, no. 9, pp. 28–36, Sep. 2021.