@article{TAC_2012_26_a26,
     author = {R. Rosebrugh and N. Sabadini and R. F. C. Walters},
     title = {Tangled circuits},
     journal = {Theory and applications of categories},
     pages = {743--767},
     publisher = {mathdoc},
     volume = {26},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2012_26_a26/}
}