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2. Barut, A. O.: Application of the dynamical group theory to the structure of the hadrons. Lectures in theoretical physics (Ed. Barut, A. O., Brittin, W. E.), Vol. 10B, pp. 377–426. New York: Gordon and Breach 1967
3. Gelfand, I. M., Kirillov, A. A.: Inst. Hautes Etudes Sci. Publ. Math.31, 5 (1966)
4. Jacobson, N.: Lie algebras. New York: Interscience 1962
5. Joseph, A.: To appear