Pratiwi, Andini, et al. “Detection of the Use of Mask to Prevent the Spread of COVID-19 Using SVM, Haar Cascade Classifier, and Robot Arm”. Data Science: Journal of Computing and Applied Informatics, vol. 6, no. 2, July 2022, pp. 125-37, doi:10.32734/jocai.v6.i2-9289.