Olusoji Olujimi, Olanrewaju, et al. “Solid-Phase Extraction Method for the Analysis of Eleven Phenolic Pollutants in Water Samples &Nbsp”;. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 657-62, https://asianpubs.org/index.php/ajchem/article/view/15838.