Venkatasen, M., Mathivanan, S.K., Mani, P., Jayagopal, P., P, T., Sorakaya Somanathan, M., Babu K, U. and D, E. 2021. Effectiveness of Contact Tracing Using KNN for COVID-19. Journal of Mobile Multimedia. 17, 4 (Jun. 2021), 789–808. DOI:https://doi.org/10.13052/jmm1550-4646.17415.