THE EFFECT OF TEMPERATURE ON THE CALORIFIC VALUE OF BRIQUETTES FROM COFFEE GROUNDS WASTE AS AN ALTERNATIVE FUEL. einstein e-j. [Internet]. 2024 Oct. 7 [cited 2026 Mar. 23];12(3):58-65. Available from: https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/49010