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The 2,3-Dimethylenetetramethylene Diradical

 B. G. Odell, R. Hoffmann and A. Imamura, J. Chem. Soc. (B), 1675 (1970).

A Potential Surface for a Nonconcerted Reaction. Tetramethylene

 R. Hoffmann, S. Swaminathan, B. G. Odell and R. Gleiter, J. Amer. Chem. Soc., 92, 7091 (1970).

Chemical Reactivity of Molecules in their Excited States

R. Hoffmann in Aspects de la Chimie Quantique Contemporaine, ed. R. Daudel and A. Pullman, CNRS, Paris, (1971).

The Valence Orbitals of Cyclobutane

 R. Hoffmann and R. B. Davidson, J. Amer. Chem. Soc., 93, 5699 (1971).

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