@article{TAC_2007_18_a11,
     author = {Marco Grandis},
     title = {Higher cospans and weak cubical categories {(Cospans} in algebraic topology, {I)}},
     journal = {Theory and applications of categories},
     pages = {321--347},
     publisher = {mathdoc},
     volume = {18},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2007_18_a11/}
}