1. Apel, J. and Klaus, U., FELIX-an assistent for algebraists, in S. M. Watt (ed.),ISSAC'91, ACM Press, 1991, pp. 382?389.
2. Buchberger, B., An algorithmic method in polynomial ideal theory, Chapter 6 in N. K. Bose (ed.),Recent Trends in Multidimensional System Theory, D. Reidel, Dordrecht, 1984.
3. Masuda, T., Nakagami, Y. and Watanabe, I., Noncommutative differential geometry on the quantum two sphere of Podl�s I.,K-Theory 5, 151?175 (1991).
4. Noumi, M. and Mimachi, K., Quantum 2-spheres and big q-Jacobi polynomials,Comm. Math. Phys. 128, 521?531 (1990).
5. Parshall, B. and Wang, J., Quantum linear groups,Mem. Amer. Math. Soc. 439, Amer. Math. Soc., Providence, RI, 1991.