1. T. Eicher , S.Hauptmann and A.Speicher, The Chemistry of Heterocycles, 2nd ed., Wiley-VCH, 2003, Chapter 6
2. M. Tišler and B.Stanovnik, Comprehensive Heterocyclic Chemistry, ed. A. R. Katritzky and C. W. Rees, Pergamon Press, Oxford, 1984, Vol. 3, p. 1
3. W. J. Coates , Comprehensive Heterocyclic Chemistry, ed. A. R. Katritzky, C. W. Rees and E. F. V. Scriven, Pergamon, Oxford, 2nd edn, 1996, Vol. 6, p. 1
4. Reactions of Tetrazines with Unsaturated Compounds. A New Synthesis of Pyridazines
5. Diels-Alder reactions of heterocyclic aza dienes. Scope and applications