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2. S. Kobayashi and K. A. Jorgensen, Cycloaddition Reactions in Organic Synthesis (Wiley, New York, 2001).
3. A. S. Onishchenko, Diene Synthesis (Nauka, Moscow, 1963) [in Russian].
4. W. Carruthers Cycloaddition Reactions in Organic Synthesis (Pergamon, Oxford, 1990).
5. A. Padwa, 1,3-Dipolar Cycloaddition Chemistry (Wiley, New York, 1984).