Intensities of Electronic Transitions in Molecular Spectra IV. Cyclic Dienes and Hyperconjugation Robert S. Mulliken J. Chem. Phys. -- May 1939 -- Volume 7, Issue 5, pp. 339-352 doi10.1063/1.1750446
Kistiakowsky, G. B. et al. (1937). «Energy Changes Involved in the Addition Reactions of Unsaturated Hydrocarbons». Chem. Rev.20: 181. doi:10.1021/cr60066a002.
Liebman, J.F. et al. (2003). «The Conjugation Stabilization of 1,3-Butadiyne is Zero». Org. Lett.5: 2373. doi:10.1021/ol030019h.
Fernandez, I., Frenking, G. (2006). «Direct Estimate of the Strength of Conjugation and Hyperconjugation by the Energy Decomposition Analysis Method». Chem. Eur. J.12: 361. doi:10.1002/chem.200501405.
Ingold, K.U.; Dilabio, G.A. (2006). «Bond Strengths: the Importance of Hyperconjugation». Org. Lett.8: 592. doi:10.1021/ol062293s.