1. Griffiths, P., Harris, J.: Principles of Algebraic Geometry. A Wiley-Interscience publication, New York: John Wiley & Sons, 1978
2. Mathematical surveys;V. Guillemin,1977
3. Guillemin, V., Sternberg, S.: Symplectic techniques in Physics. Cambridge: Cambridge University Press, 1984
4. Guillemin, V., Sternberg, S.: The Gelfand-Cetlin System and quantization of the Complex Flag Manifold. J. Funct. Analysis52, 106–128 (1983)
5. Kostant, B.: Orbits, Symplectic Structures and Representation Theory. Proceedings of the United States-Japan seminar in differential geometry, Kyoto, Japan, 1965, p. 71