HE(I) PHOTOELECTRON-SPECTRA OF TRICARBONYL-IRON AND TRICARBONYL-RUTHENIUM COMPLEXES OF CYCLIC DIENES, AND OF TRICARBONYLCYCLOHEPTATRIENE- IRON AND TRICARBONYLCYCLO-OCTATETRAENE-IRON - Green, J; Powell, P; Vantilborg, J (1976)