@article{GT_2005_9_4_a13,
     author = {Freedman, Michael H and Kitaev, Alexei and Nayak, Chetan and Slingerland, Johannes K and Walker, Kevin and Wang, Zhenghan},
     title = {Universal manifold pairings and positivity},
     journal = {Geometry & topology},
     pages = {2303--2317},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2005},
     doi = {10.2140/gt.2005.9.2303},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2005.9.2303/}
}