Ramazani A, Amini I, Massoudi A. Bentonite Powder Catalyzed Synthesis of Coumarins from in situ Generated Stabilized Phosphorus Ylides in Solvent-free Conditions. ajc [Internet]. 2010 Mar. 30 [cited 2024 Aug. 26];18(1):698-700. Available from: https://asianpubs.org/index.php/ajchem/article/view/21430