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Beez, M.; Bieri, G.; Bock, H.; Heilbronner, E., The ionization potentials of butadiene, hexatriene, andtheir methyl derivatives: evidence for through space interaction between double bond «pi»-orbitals and non-bonded pseudo-«pi» orbitals of methyl groups?, Helv. Chim. Acta, 1973, 56, 1028. [all data]