FAUZIYAH, Begum; KHOIRIYAH, Muslimatul; HAKIM, Abdul; WAFI, Abdul. Development of Urea Sensor Based on colorimetric method and Digital RGB Analysis. International Journal of Engineering and Technology, [S. l.], v. 8, n. 1.9, p. 332–334, 2019. DOI: 10.14419/ijet.v8i1.9.26680. Disponível em: https://sciencepubco.com/index.php/IJET/article/view/26680.. Acesso em: 11 aug. 2025.