Samadizadeh, Marjaneh. “Silica Supported H3PW12O40: An Efficient Catalyst for the Synthesis of Spirooxindoles via a One-Pot Reaction under Solvent Free Conditions”. Asian Journal of Chemistry 25, no. 2 (September 8, 2012): 926–928. Accessed June 2, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_2_75.