Sulistiyowati, Indah, and Moh Imam Muhyiddin. 2021. “Disinfectant Spraying Robot to Prevent the Transmission of the Covid-19 Virus Based on the Internet of Things (IoT)”. Journal of Electrical Technology UMY 5 (2):61-67. https://doi.org/10.18196/jet.v5i2.12363.