Probing a nucleon spin structure at TESLA by the real polarized gamma beam S. Alekhin, V. Borodulin, A. Çelikel, M. Kantar and S. SultansoyEur. Phys. J. C, 11 2 (1999) 301-307DOI: https://doi.org/epjc/v11/p301(epjc0184)