Can the total angular momentum of u-quarks in the nucleon be accessed at HERMES? F. Ellinghaus, W.-D. Nowak, A.V. Vinnikov and Z. Ye Eur. Phys. J. C, 46 3 (2006) 729-739 Published online: 31 March 2006 DOI: 10.1140/epjc/s2006-02529-3