A STUDY OF THE ELECTRONIC-STRUCTURE OF THE DIMERS [CO2(ETA-C5ME5)2(CO)2], [RH2(ETAC5ME5)2(CO)2], [CO2(ETAC5ME5)2(NO)2], AND [CO2(ETAC5ME5)2-(CO)(NO)] BY HE-I AND HE-II PHOTOELECTRON-SPECTROSCOPY - Dudeney, N; Green, J; Kirchner, O; Smallwood, F (1984)