Proposing Algorithm for Warning Minimum Distance Violation and Tracking Covid-19 Object Using YOLOV4 Model. - Phat Nguyen Huu; Trang Nguyen Thi; Chau Nguyen Le Bao; Minh Nguyen Anh; Hieu Nguyen Duc; Minh-Trien Pham; Dat Vu Tien; Minh-Triet Tran (RIVF, 2022)