1. Huisgen, R. Angew. Chem. Int. Ed. 1969, 8, 513
2. (b) Huisgen R. in The Adventure Playground of Mechanisms and Novel Reactions: Profiles, Pathways and Dreams (Ed.: Seeman, J. I.), American Chemical Society, Washington DC, 1994, p. 62.
3. (a) Brunn, E.; Huisgen, R. Angew. Chem. Int. Ed. 1969, 8, 513;
4. (b) Huisgen R. in The Adventure Playground of Mechanisms and Novel Reactions: Profiles, Pathways and Dreams (Ed.: Seeman, J. I.), American Chemical Society, Washington DC, 1994, p. 62.