Unrestricted symmetry-projected Hartree-Fock-Bogoliubov calculations for SD-shell nuclei E. Hammarén, K.W. Schmid and A. Faessler Eur. Phys. J. A, 2 4 (1998) 371-377 Published online: 15 August 1998 DOI: 10.1007/s100500050133