Pfeiffer, Hendryk Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
0602047.pdf (Preprint), 2MB
Lauda, A. D., & Pfeiffer, H. (2007). State sum construction of two-dimensional open-closed topological quantum field theories. Journal of Knot Theory and its Ramifications, 16(9), 1121-1136. doi:10.1142/S0218216507005725.