Lei, Y.Y., F.S. Wang, W.Y. Ni, Y.F. Jin, X.W. Li, and W.G. Cao. 2015. “Evaluation and Correction of Spectrophotometric Determination of Alkali Extracted Biogenic Silica”. Asian Journal of Chemistry 27 (4):1231-34. https://doi.org/10.14233/ajchem.2015.17193.