HERMAWAN, A.; NAPOLEON, A.; BAKRI, B. Physical Properties of Briquette Fertilizers Made from Urea and Fly Ash-Azolla. JOURNAL OF TROPICAL SOILS, [S. l.], v. 23, n. 3, p. 143–150, 2019. DOI: 10.5400/jts.2018.v23i3.143-150. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/282. Acesso em: 29 jul. 2025.