Ess, D. H.; Houk, K. N. (2007-08-09). "Distortion/Interaction Energy Control of 1,3-Dipolar Cycloaddition Reactivity". Journal of the American Chemical Society. 129 (35): 10646–10647. doi:10.1021/ja0734086. PMID17685614.
Ess, D. H.; Houk, K. N. (2007-08-09). "Distortion/Interaction Energy Control of 1,3-Dipolar Cycloaddition Reactivity". Journal of the American Chemical Society. 129 (35): 10646–10647. doi:10.1021/ja0734086. PMID17685614.