@inproceedings{søren2007the,
title={The homotopy type of the cobordism category},
author={Søren Galatius, Ib Madsen, Ulrike Tillmann, and Michael Weiss},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203353152104712},
booktitle={Acta Mathematica},
volume={202},
number={2},
pages={195-239},
year={2007},
}
Søren Galatius, Ib Madsen, Ulrike Tillmann, and Michael Weiss. The homotopy type of the cobordism category. 2007. Vol. 202. In Acta Mathematica. pp.195-239. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203353152104712.