1. Alfsen, E. M.,Compact Convex Sets and Boundary Integrals (Springer, Berlin, 1971).
2. Alfsen, E. M., Shultz, F. W., and Størmer, A., ?A Gel'fand-Naimark-Segal theorem for Jordan algebras,?Commun. Math. Phys. 28, 11?56 (1978).
3. Aerts, D., and Daubechies, L., Physical justification for using tensor product to describe quantum systems as one joint system,Helv. Phys. Acta 51, 661?675 (1978).
4. Beltrametti, E., and Cassinelli, G.,The Logic of Quantum Mechanics (Addison-Wesley, Reading, Mass., 1981).
5. Bunce, I. J., and Wright, J. D. M., ?Quantum measures and states on Jordan algebras,?Comm. Math. Phys. 98, 187?202 (1988).