H Hemanth Bharath Bhushan, B Honnaraju, L Hemanth Raj, T C Kishore, and V Likhith. “Automated Human Following Trolley Using Image and Video Processing”. International Journal of Computer Engineering in Research Trends, vol. 7, no. 7, July 2020, pp. 6-12, https://www.ijcert.org/index.php/ijcert/article/view/598.