DHANALAKSHMI R; REIKHA C. IoT based dipstick type engine oil level and impurities systems: portable online spectrophotometer. International journal of intellectual advancements and research in engineering computations, [S. l.], v. 8, n. 2, p. 266–274, 2021. DOI: 10.61096/ijiarec.v8.iss2.2020.266-274. Disponível em: https://ijiarec.com/ijiarec/article/view/77. Acesso em: 15 aug. 2026.