ELECTRONIC PROPERTIES OF MOLYBDENUM-IRON-SULFUR-CLUSTERS : APPROACHES TO THE MOLYBDENUM SITE IN NITROGENASE R.B. Frankel, T.E. Wolff, P.P. Power et R.H. Holm J. Phys. Colloques, 41 C1 (1980) C1-495-C1-496 DOI: 10.1051/jphyscol:19801196