A. REZA KAZEMIZADEH and A. RAMAZANI, “Three-Component Synthesis of Dialkyl 2-(Dicyanomethyl)- 3-(triphenyl-?5)phosphoranylidene)succinates from Triphenylphosphine, Acetylenic Esters and Malononitrile in Solvent-Free Conditions”, ajc, vol. 19, no. 7, pp. 5425–5428, Mar. 2010.