CALIBRATION OF ISOMER SHIFTS IN THE HEAVY RARE EARTH BY CONVERSION ELECTRON SPECTROSCOPY G.M. Kalvius, P. Maier-Komor and K. Schreckenbach J. Phys. Colloques, 41 C1 (1980) C1-61-C1-62 DOI: 10.1051/jphyscol:1980111