Elements of Organic Photochemistry
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Chem. Soc. 85, 3894 (1963). H. E. Zimmerman, in Abstract of Papers, 17th
National Organic Chemistry Symposium, American Chemical Society,
Bloomington, Indiana (June 1961), p. 31. R. Hoffmann and W. N. Lipscomb, J.
Chem. Phys.