@article{TAC_2007_18_a18,
     author = {Marco Grandis},
     title = {Collared cospans, cohomotopy and {TQFT} 
(cospans in algebraic topology, {II)}},
     journal = {Theory and applications of categories},
     pages = {602--630},
     publisher = {mathdoc},
     volume = {18},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2007_18_a18/}
}