1. Particle Data Group, Phys. Rev. D 50 (1994).
2. T.H. Burnett, Physics of 0++ and 2++ mesons, these Proceedings.
3. S. Godfrey and N. Isgur, Phys. Rev. D32 (1985) 189.
4. A. Falvard et al, Phys. Rev. D41 (1990) 1389.
5. D. Coffman et al., Phys. Rev. D38 (1988) 2695.