1. The Chemistry of the Hydrazo, Azo and Azoxy Groups, ed. S. Patai, JohnWiley and Sons, Chichester, 1st edn, 1997
2. D. L. Boger and S. N.Weinreb, Hetero Diels-Alder Methodology in Organic Synthesis, Academic Press, San Diego, 1987
3. Synthesis of Mutual Azo Prodrugs of Anti-inflammatory Agents and Peptides Facilitated by α-Aminoisobutyric Acid
4. T. König , In Free Radicals, ed. J. K. Kochi, Wiley, New York, 1973, vol. I, p. 113