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Aicher, S. and Brack, Matthias (1988) A consistent nonrelativistic quark model with dynamical pion exchange. Physics Letters B (207 B), pp. 11-16.
Meyer, J. and Bartel, J. and Brack, Matthias and Quentin, P. and Aicher, S. (1986) A simple Gaussian approximation for the one-body density matrix. Physics Letters B (172 B), pp. 122-128.