1. Infinite Loop Spaces;Adams,1978
2. Higher-dimensional algebra. II. 2-Hilbert spaces;Baez;Adv. in Math.,1997
3. Introduction ton;Baez,1997
4. Higher-dimensional algebra and topological quantum field theory;Baez;Math. Phys.,1995
5. J. Baez, J. Dolan, Nov. 30, 1995