Gweryina, R.I., Madubueze, C.E. and Nwaokolo, M.A. 2021. Mathematical Modelling and Control of COVID-19 Transmission in the Presence of Exposed Immigrants. Communication in Biomathematical Sciences. 4, 2 (Dec. 2021), 93-105. DOI:https://doi.org/10.5614/cbms.2021.4.2.2.