1. J. Alev, T.J. Hodges, and J. D. VelezFixed rings of the Weyl algebra, Ai(C) Preprint (1989).
2. H.H. Andersen, Schubert varieties and, Demazure’s character formula, Invent. Math.79 (1985), 611–618.
3. Serie I 292;A Beilinson,1981
4. E. BenluluThèse, Haifa (1990).
5. I.N. BernsteinThe analytic continuation of generalized functions with respect to a parameter, Funct. Anal. Appl.6 (1972), 26–40.