F. Shirini, M. Abedini, A. N. Abkenar, and B. Baghernejad, “Sulfonic acid-functionalized ordered nanoporous Na+-montmorillonite (SANM) as an efficient and recyclable catalyst for the tetrahydropyranylation and detetrahydropyranylation of alcohols and phenols”, J. Nanostruct. Chem., vol. 4, no. 1 (March 2014), Feb. 2014, doi: 10.1007/s40097-014-0085-2.