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2. Proceedings of the Interdisciplinary Workshop on Momentum Distribution, Argonne National Laboratory, October, 1988 (to be published);
3. Sokol, P. E., Silver, R. N., Clark, J. W.: Preprint LA-UR-89-1604. Los Alamos 1989
4. The European Muon Collaboration: Aubert, J. J., et al.: Nucl. Phys.B 293, 740 (1987)
5. Thomas, A. W.: Prog. Part. Nucl. Phys.20, 21 (1987) and references therein