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Andrea, R.R.; Cerfontain, H.; Lamberchts, H.J.A.; Louwen, J.N.; Oskam, A., He I and He II photoelectron spectra and CNDO/S and MNDO MO calculations of some bridged  annulenes, J. Am. Chem. Soc., 1984, 106, 2531. [all data]