YOHAN, Yohan; ASTUTI, Fifit; WICAKSANA, Adimas. Colorimeter Portable to Determine Ammonium Using to Manure Tetector. Piston: Journal of Technical Engineering, [S. l.], v. 4, n. 2, p. 48–55, 2021. DOI: 10.32493/pjte.v4i2.9617. Disponível em: https://openjournal.unpam.ac.id/index.php/Piston/article/view/9617. Acesso em: 23 nov. 2024.