Okwonu, Friday Zinzendoff, et al. “Covid-19 Prediction Model (COVID-19-PM) For Social Distancing: The Height Perspective: COVID-19 Prediction Model for Social Distancing: The Height Perspective”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 57, no. 4, July 2021, pp. 93-98, http://ppaspk.org/index.php/PPAS-A/article/view/434.