1. Abe, E., Hopf Algebras, Cambridge Univ. Press, 1980.
2. Brzeziński, T., Remarks on bicovariant differential calculi and exterior Hopf algebras, Preprint DAMTP/92-11, 1992.
3. BrzezińskiT., DabrowskiH., and RembielińskiJ., On the quantum differential calculus and the quantum holomorphicity, J. Math. Phys. 33, 19 (1992).
4. Brzeziński, T. and Majid, S., Quantum group gauge theory on quantum spaces, Preprint DAMTP/92-27, 1992.
5. CoquerauxR. and KastlerD., Remarks on the differential envelopes of associative algebras, Pacific J. Math. 137, 245 (1989).