1. 2-tangles;Baez;Lett. Math. Phys.,1998
2. J. Baez, and, L. Langford, Higher-dimensional algebra. IV. 2-Tangles, Adv. in Math, to appear, preprint available at, http://xxx.lanl.gov/abs/math.QA/9811139.
3. Automorphic sets and singularities;Brieskorn;Contemp. math.,1988
4. J. S. Carter, D. Jelsovsky, S. Kamada, L. Langford, and, M. Saito, Quandle cohomology and state-sum invariants of knotted curves and surfaces, preprint available at, http://xxx.lanl.gov/abs/math.GT/9903135.
5. J. S. Carter, L. H. Kauffman, and, M. Saito, Structures and diagrammatics of four-dimensional topological lattice field theories, Adv. in Math, to appear.