1. For a description of the basic non-relativistic quark model, see R.H. Dalitz, in High Energy Physics,Les Houches 1965 Lectures, C. de Witt and M. Jacob, eds., Gordon & Breach, New York (1966) pp. 251 ff. The QCD-inspired version was first worked out by A. de Rujula, H. Georgi, S.L. Glashow, Phys. Rev. D12, 147 (1975).
2. See the excellent review article by N.A. Tórngvist, Acta Phys. Pol.,B16, 513 (1985);
3. N. Isgur, in The New Aspects of Subnuclear Physics,A Zichichi, ed., Plenum Press, New York, (1980).
4. Such calculations were explicitly done for low-mass pseudoscalar mesons: J.F. Donoghue, and H. Gomm, Phys. Lett. 121b, 49 (1983).
5. See also the summary talk of Hadron ‘87 by J.L. Rosner in the Proceedings volume, KEK 87–7(1987).