BEIRAGHI, A., & BABAEE, S. (2010). Cloud Point Extraction Based on Binary Surfactants for Separation, Preconcentration and Spectrophotometric Determination of Beryllium with 1,8-Dihydroxy Anthrone. Asian Journal of Chemistry, 20(3), 1999–2010. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/19189