Sharma, D., A. Sharma, D. Monga, and A. Aggarwal. “A Narrative Review of Testing Recommendations for COVID-19: The Changing Scenarios”. International Journal of Health Systems and Implementation Research, Vol. 4, no. 2, Sept. 2020, pp. 70-79, https://ijhsir.ahsas-pgichd.org/index.php/ijhsir/article/view/100.