Xu, Tong, Shanyue Zhou, Jun Steed Huang, and Wandong Zhang. 2023. “Normalized Semi-Covariance Co-Efficiency Analysis of Spike Proteins from SARS-CoV-2 Variant Omicron and Other Coronaviruses for Their Infectivity and Virulence”. Archives of Clinical and Biomedical Research 7 (3):387-99. https://fortunejournals.org/ojs/index.php/acbr/article/view/15022.