Chavan, Laxmikant D., et al. “Montmorillonite K-10 Supported 11-Molybdo-1-Vanadophosphoric Acid (H4PMo11V1O40 K-10) Catalysts for Environmentally Benign Synthesis of 2H-indazolo[2,1-b]phthalazine-Triones Under Solvent-Free Condition”. Orbital: The Electronic Journal of Chemistry, vol. 9, no. 4, Oct. 2017, pp. 210-8, https://periodicos.ufms.br/index.php/orbital/article/view/16428.