Kreck, Matthias Max Planck Institute for Mathematics, Max Planck Society;
Teichner, Peter Max Planck Institute for Mathematics, Max Planck Society;
Kreck, M., & Teichner, P. (2008). Positivity of topological field theories in dimension at least 5. Journal of Topology, 1(3), 663-670. doi:10.1112/jtopol/jtn016.