Two-neutrino positron double-beta decay of 106Cd for the 0+ → 0+ transition A. Shukla, P. K. Raina, R. Chandra, P. K. Rath and J. G. Hirsch Eur. Phys. J. A, 23 2 (2005) 235-242 Published online: 15 December 2004 DOI: 10.1140/epja/i2004-10084-x