STUDY OF THE PROPERTIES OF AN UNUSUAL DISULFUR LIGAND - COMPARATIVE OBSERVATIONS OF THE CHEMISTR OF (C5ME5)2 "CR2(MU,ETA-1-S2)(MU,ETA-2-S2)(MU-S) AND (C5ME5)2MO2(MU,ETA-2-S2)(MU-S)2 Journal Article