Okieimen, C O, F E Okieimen, and A O Aluyab. 2001. “EVOLUTION OF SURFACE AREA OF CLAY TREATED WITH SULPHUROUS ACID AND ITS SUBSEQUENT ACTIVATION: Short Communications”. Biological Sciences - PJSIR 44 (1):25-26. https://v2.pjsir.org/index.php/biological-sciences/article/view/1866.