Thye, A. Y.-K. ., K.-Y. Loo, K. B. C. Tan, J. M.-S. Lau, and V. Letchumanan. “Insights into COVID-19 Delta Variant (B.1.617.2)”. Progress In Microbes & Molecular Biology, vol. 4, no. 1, Nov. 2021, doi:10.36877/pmmb.a0000243.