1. R. Rastaldo, C. Penna, P. Pagliaro, Life Sci. 69 (2001) 729.
2. M.E. Wolff, Burger’s Medicinal Chemistry and Drug Discovery, Wiley, New York, 1997.
3. A. Oliva, G. Zimmermann, H.-W. Krell, Barbituric Acid Derivatives with Antimetastatic and Antitumor Activity, Intetnational Patent WO 98/58925.
4. M. Gleason, R. Gosselin (Eds.), Clinical Toxicology of Commercial Products, Williams & Wilkins Co, Baltimore, MA, 1963, pp. 26–27.
5. R. Acheson, Introduction to the Chemistry of Hetero-Cyclic Compounds, Interscience Publishers, New York, 1967, pp. 339–342.