1. [AR1] Aitchison, I.R., Rubinstein, J.H.: An introduction to polyhedral metrics of non-positive curvature on 3-manifolds. In: Geometry of Low-Dimensional Manifolds, vol. II: Symplectic Manifolds and Jones-Witten Theory pp. 127?161. Cambridge: Cambridge University Press, 1990
2. [AR2] Aitchison, I.R., Rubinstein, J.H.: Combinatorial cubings, cusps, and the dodecahedral knots. In: Proceedings of the Research Semester in Low Dimensional Topology at Ohio State University. Topology90 (to appear)
3. [AR3] Aitchison, I.R., Rubinstein, J.H.: Canonical surgery on alternating link diagrams, In: Proceedings of the International Conference on Knots, Osaka 1990 (to appear)
4. [AR4] Aitchison, I.R., Rubinstein, J.H.: Polyhedral metrics of non-positive curvature on 3-manifolds with cusps. (In preparation)
5. [BGS] Ballman, W., Gromov, M., Schroeder, V.: Manifolds of nonpositive curvature. Boston: Birkh�user 1985