• [1]

    S. P. Sorensen et al. (WA80), Z. Phys., C38(1988), 3;R. Albrecht et al. (WA80), preprint GSI-87-60.[2] T. Akesson et al. (HELlOS), Z. Phys., C38(1986), 15, 59, 85;A. Barnberger et al. (NA35), Z. Phys., C38(1988), 19, 89;R. Alberchr et al. (WA80), Z. Phys , C38(1988), 51, 97, 109;1. Orterlund, Z. Phys, C38(1988), 65.[3] B. Bassalleck et al. (E814), Z. Phys., C38(1988), 45;T. Abbort et al. (E802), 2. Phys., C38(1988), 35, 135.[4] Cai Xu, Chao Wei-qin, Meng Ta-chung, Phys. Rev., D36(1987), 2009.[5] A. Bealas, M. Bleszynski, W. Czyz, Nucl. Phys., B111(1976), 461.[6] Liu Lian-sou, Meng Ta-chung, Peng Hong-an. Phys. Rev., D37(1988), 3327;Liu Lian-sou, Meng Ta-chung, Pan Ji-cai, Peng Hong-an, preprint FUB-HEP/88-1.[7] Chao Wei-qin, Ren Jiang-long, preprint BIHEP-TH-88-11.[8] A. D. Jackson, H. Boggild, Nucl. Phys., A470(1987). 669;A. Capella, J. Tran Thanh Van, 2. Phys., C38(1988), 177. B. Andersson, Nucl. Phys , A461(1987), 513c;J. Ftacnik et al., Phys. Lett., B188(1987), 279;K. Werner, Z. Phys. C38(1988), 193;Chao Wei-qin, Liu Bo, preprint BlHEP-TH-88-12.