1. Alvarez Gaumé, L., and Labastida, J. (1990).Nuclear Physics B (Proceedings Supplement)18B, 1?9.
2. Alvarez Gaumé, L., Labastida, J., and Ramallo, A. (1990).Nuclear Physics B,334, 103?24.
3. Ashtekar, A. (1991).Lectures on Non-Perturbative Canonical Gravity, World Scientific, Singapore.
4. Ashtekar, A., and Isham, C. (1992).Classical and Quantum Gravity,9, 1433?1485.
5. Ashtekar, A., and Lewandowski, J. (n.d.). Representation theory of analytic holonomyC * algebras, inKnots and Quantum Gravity, J. Baez, ed., Oxford University Press, Oxford, in press.