1. Borel A, Linear Algebraic groups, (New York: W. A. Benjamin) (1969)
2. Bourbaki N, Groupes et algébres de Lie, Chapitres 4, 5 et 6, (Paris: Hermann) (1968)
3. Lakshmibai V, Kempf varieties,J. Indian Math. Soc.
40 (1976), 299–349
4. Lakshmibai V and Seshadri C S, Geometry of G/P-II,Proc. Indian Acad. Sci.
A87 (1978) 1–54
5. Lakshmibai V and Seshadri C S, Geometry of G/P-V,J. Alqebra, 100 (1986) 463–557