Ulfa, Siti Novita Sari, and Samik Samik. “REVIEW ARTICLE: UTILIZATION OF ACTIVATED NATURAL ZEOLITE CATALYST IN BIODIESEL SYNTHESIS WITH ESTERIFICATION AND TRANSESTERIFICATION METHOD”. Unesa Journal of Chemistry, vol. 11, no. 3, Jan. 2023, pp. 165-81, doi:10.26740/ujc.v11n3.p165-181.