A. Ramazani, A. Reza Kazemizadeh, E. Ahmadi, and M. Rahnema, “Silica Gel Powder Catalyzed Intermolecular Wittig Reaction of Fluorine-containing Stabilized Phosphorus Ylides with Ninhydrin in Solvent-free Conditions”, ajc, vol. 18, no. 1, pp. 701–703, Mar. 2010.