S.JayaChitra1, S.Kavin, S.Sasi, and R.Sethupathi. “IOT Based Coal Mine Workers Safety Monitoring and Alerting System”. International Journal of Intellectual Advancements and Research in Engineering Computations, vol. 10, no. 2, June 2022, pp. 188-91, doi:10.61096/ijiarec.v10.iss2.2022.188-191.