The gJ-factor in the ground state of Ca+ G. Tommaseo, T. Pfeil, G. Revalde, G. Werth, P. Indelicato and J. P. Desclaux Eur. Phys. J. D, 25 2 (2003) 113-121 Published online: 29 April 2003 DOI: 10.1140/epjd/e2003-00096-6