1. For a recent review, see, e.g. D. Gromes: in Proc. Yukon Advanced Study Institute, 1984, eds. N. Isgur et al. (Singapore: World Scientific 1985) and other contributions in these proceedings; Martin, A.: in Physics with antiproton at LEAR in the ACOL era, ed. U. Gastaldi et al., Gif-sur-Yvette: éditions Frontières, 1985
2. For a recent review, see e.g., M. Oka, K. Yazaki: in Quarks and nuclei, ed. W. Weise, Singapore: World Scientific 1985
3. J.P. Adler, J.M. Richard, P. Taxil: Phys. Rev.D25, 2370 (1982)
4. J.L. Ballot, J.M. Richard: Phys. Lett.123B, 449 (1983)
5. J. Weinstein, N. Isgur: Phys. Rev. Lett.48, 659 (1982); Phys. Rev.D27, 588 (1983)