M. D.Saud, Muthanna, F. H. Al-Jawad, Fuad, A. K. Sharrad, and Adheed, “Synthesis of ketoprofen - L- phenylalanine and Ketoprofen -y- Aminobutyric acid ethyl esters as possible prodrugs”, Iraqi J. Pharm., vol. 6, no. 1, pp. 20–24, Dec. 2006.