@article{TAC_2020_35_a47,
     author = {John C. Baez and Kenny Courser},
     title = {Structured cospans},
     journal = {Theory and applications of categories},
     pages = {1771--1822},
     publisher = {mathdoc},
     volume = {35},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2020_35_a47/}
}