AN ESTIMATION OF THE RATES OF (TWO-NEUTRINO) DOUBLE BETA DECAY AND RELATED PROCESSES J. Abad, A. Morales, R. Núñez-Lagos and A.F. Pacheco J. Phys. Colloques, 45 C3 (1984) C3-147-C3-150 DOI: 10.1051/jphyscol:1984328