Simanjuntak, Vebiulina, et al. “Effect of Adsorbent Type and Coulomn Lenght on Long Purification Time Liquid Smoked of Coconut Shell”. Jurnal BETA (Biosistem Dan Teknik Pertanian), vol. 11, no. 2, Sept. 2023, pp. 245-53, doi:10.24843/JBETA.2023.v11.i02.p31.