Hemasri, Y., et al. “Anchored Montmorillonite Diphenyl Phosphino Palladium(II) Chloride Mediated Hydrogenation of Maleic Anhydride and Its Related Geometric Isomers: A Kinetic Study”. Asian Journal of Chemistry, vol. 22, no. 4, Mar. 2010, pp. 2565-74, https://asianpubs.org/index.php/ajchem/article/view/11444.