Kumar, Sunil, Md. Saifuddin Khalid, and R.H. Udupi. “One Pot Synthesis of Benzopyrans in Water As Green Solvent”. Asian Journal of Chemistry 22, no. 4 (March 30, 2010): 2685–2688. Accessed November 25, 2024. https://asianpubs.org/index.php/ajchem/article/view/11462.