Osakwe, S A, and A U C Maduako. “RECLAMATION OF WASTE LUBRICATING OILS USING GROUND PERIWINKLE SHELL ADSORBENTS”. Biological Sciences - PJSIR 47, no. 4 (August 30, 2004): 312–315. Accessed November 24, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1541.