Crane, Louis; Yetter, David On algebraic structures implicit in topological quantum field theories. (English) Zbl 0935.57025 J. Knot Theory Ramifications 8, No. 2, 125-163 (1999). MSC: 57N10 81T99 57M50 57N13 PDFBibTeX XMLCite \textit{L. Crane} and \textit{D. Yetter}, J. Knot Theory Ramifications 8, No. 2, 125--163 (1999; Zbl 0935.57025) Full Text: DOI arXiv
Crane, Louis Clock and category: Is quantum gravity algebraic? (English) Zbl 0848.57035 J. Math. Phys. 36, No. 11, 6180-6193 (1995). MSC: 57R99 83E99 81T99 PDFBibTeX XMLCite \textit{L. Crane}, J. Math. Phys. 36, No. 11, 6180--6193 (1995; Zbl 0848.57035) Full Text: DOI arXiv