You may also wish to search for items by Campbell, A. and Campbell.
Only one matching reference was found.
Calabro, D.C.; Hubbard, J.L.; Blevins, C.H., II; Campbell, A.C.; Lichtenberger, D.L., The effects of methyl group substitution on metal-coordinated cyclopentadienyl rings. The core and valence ionizations of methylated tricarbonyl(η5-cyclopentadienyl)metal complexes, J. Am. Chem. Soc., 1981, 103, 6839. [all data]