1. H. H. Andersen, J. C. Jantzen, and W. Soergel, Representations of quantum groups at a pth root of unity and of semisimple groups in characteristic p: independence of p, Astérisque 220 (1994).
2. A. J. Berkson, The u—algebra of a restricted Lie algebra is Frobenius, Proc. Amer. Math. Soc.
15 (1964), 14–15.
3. R. E. Block, Trace forms on Lie algebras, Canad. J. Math.
14 (1962), 553–564.
4. A. Borel, Linear Algebraic Groups, 2nd ed., Graduate Texts in Math. 126, Springer, New York etc. 1991.
5. W. Borho, P. Gabriel, and R. Rentschler, Primideale in Einhüllenden auflösbarer Lie-Algebren, Lecture Notes in Math. 357, Springer, Berlin etc. 1973.