Deshmukh, S. N., L. D. Chavan, and M. S. Shingare. “Envirocat EPZG Mediated Synthesis of 3,4-Dihydropyrano[c]chromene Derivatives Under Microwave Irradiation in Solvent-Free Conditions”. Orbital: The Electronic Journal of Chemistry, Vol. 13, no. 1, Mar. 2021, pp. 28-32, https://periodicos.ufms.br/index.php/orbital/article/view/15671.