MANY-PARTICLE MANY-HOLE EXCITATIONS AND THE RETARDATION OF MAGNETIC DIPOLE AND GT TRANSITION-STRENGTHS W. Knüpfer et B. C. MetschJ. Phys. Colloques, 45 C4 (1984) C4-513-C4-517DOI: https://doi.org/10.1051/jphyscol:1984441