“RECLAMATION OF WASTE LUBRICATING OILS USING GROUND PERIWINKLE SHELL ADSORBENTS” (2004) Biological Sciences - PJSIR, 47(4), pp. 312–315. Available at: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/1541 (Accessed: 21 April 2026).