1. Abraham, R., Marsden, J.: Foundations of mechanics (2nd ed.). Reading, MA: Benjamin-Cummings 1978
2. Chernoff, P.: Mathematical obstructions to quantization. Hadronic J.4, 879 (1981)
3. Emch, G.: A geometric de-quantization programme for the solution of the Dirac problem. Preprint (1982)
4. Grothendieck, A.: La théorie de Fredholm. Bull. Soc. Math. France84, 319 (1956)
5. Jacobson, N.: Lectures in abstract algebra. Princeton: Van Nostrand 1953