NUCLEAR VOLUME AND MASS EFFECT IN THE OPTICAL ISOTOPE SHIFT OF LIGHT ELEMENTS R. BRUCH, K. HEILIG, D. KALETTA, A. STEUDEL et D. WENDLANDTJ. Phys. Colloques, 30 C1 (1969) C1-51-C1-58DOI: https://doi.org/10.1051/jphyscol:1969118