Sharifzadeh Baei, M., and M. A. Rezvani. 2011. “An Efficient, New, Simple and Rapid Method for Synthesis and Isomerization of Heteropolyanion B-[PW9O34]9-”. Asian Journal of Chemistry 23 (12):5381-83. https://asianpubs.org/index.php/ajchem/article/view/11156.