Tayebee, Reza, and Behnam Mahdavi. “Selective Protection of Alcohols As 2-Tetrahydropyranyl Acetals Using Keggin H3PW12O40 Effect of Different Reaction Parameters”. Asian Journal of Chemistry, vol. 21, no. 2, Mar. 2010, pp. 1565-8, https://asianpubs.org/index.php/ajchem/article/view/18865.