El Rafiqa, Sovia, et al. “Application of 3Å Synthetic Zeolite As an Adsorbent to Reduce the Hygroscopicity of B40 Biodiesel”. International Journal of Engineering Continuity, vol. 4, no. 2, Dec. 2025, pp. 142-60, doi:10.58291/ijec.v4i2.451.