1. J. Ashman et al., EMC collab., Phys. Lett. B206 (1988) 364; Nucl. Phys. B328 (1989) 1 and references therein.
2. V. Papavassiliou, EMC collab., Proceedings of the EPS Conf. on High Energy Physics, Uppsala 1987, ed. O. Bartner, vol. I, p. 441.
3. M.J. Alguard et al., SLAC-Yale collab., Phys. Rev. Lett. 37 (1976) 1261; G. Baum et al., SLAC-Yale collab., Phys. Rev. Lett. 45 (1980) 2000; 51 (1983) 1135.
4. G. Altarelli, Proceedings of the 27th Int. E. Majorana Summer School of Subnuclear Physics, Erice 1989, ed. A. Zichichi, Plenum Press [CERN-TH.5675/90]; and Proceedings of the HERA-Workshop, Hamburg 1991, eds. W. Buchmüller and G. Ingelmann (DESY, 1992), vol. I, p. 379 [CERN-TH.6340/91].
5. G.G. Ross, Proceedings of the 1989 Int. Symposium on Lepton and Photon Interactions at High Energies, Stanford, ed. M. Riordan (World Scientific, 1990), p. 41.