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Bibliography BIBLIOGRAPHY 1. E. Abe, Hopf Algebras, Cambridge Univ. Press, Cambridge, 1980. 2. G. Abrams and J. Haefner, Primeness conditions for group graded rings, in Ring Theory, Proc. Biennial Ohio State - Denison Conf. 1992, World Scientific, Singapore, 1993, pp. 1- 19. 3. J. Alev and F. Dumas, Sur Ie corps de fractions de certaines algebres quantiques, J. Algebra 110 (1994), 229-265. 4. J. Alev, A. 1. Ooms, and M. Van den Bergh, A class of counterexamples to the Gel'fand­ Kirillov conjecture, Trans. Amer. Math. Soc. 348 (1996), 1709-1716. 5. A. S. Amitsur, Algebras over infinite fields, Proc. Amer. Math. Soc. 1 (1956), 35-48. 6. H. H. Andersen, J. C. Jantzen, and W. Soergel, Representations of quantum groups at a p-th root of unity and of semisimple groups in characteristic p: independence of p, Asterisque 220 (1994), 1-321. 1. H. H. Andersen, P. Polo and K. Wen, Representations of quantum algebras, Invent. Math. 104 (1991), 1-59; Addendum, Invent. Math. 120 (1995), 409-410. 8. 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