HELWANI, Z.; AMRAINI, S. Z.; ASMURA, J.; SIREGAR, T. N.; TRIWAHYUNI, V. E.; ABD , A. A. Palm Frond Waste as a Carbon Source in the Synthesis of CaO/Biochar Catalysts for the Biodiesel Production Process. Heca Journal of Applied Sciences, [S. l.], v. 1, n. 1, p. 8–13, 2023. DOI: 10.60084/hjas.v1i1.9. Disponível em: https://heca-analitika.com/hjas/article/view/9. Acesso em: 23 apr. 2026.