1. Letendre, L.; McGhee, W. D.; Snoddy, C.; Klemm, G.; Gaud, H. T. WO 03/09974 A1.
2. Reddy, M.; Ramana, V.; Bell, S. C. WO 03/024400 A2.
3. 1,3-Dipolar Cycloadditions Involving X=Y Groups;Bianchi,1977
4. Cycloaddition Reactions in Organic Synthesis;Carruthers,1990
5. Chlorahine-T in Heterocyclic Synthesis;1 a Simple Procedure for the Genedation of Nitrilihines and its Application to the Synthesis of Pyrazolines