@article{TAC_2004_13_a9,
     author = {F. William Lawvere},
     title = {Functorial concepts of complexity for finite automata},
     journal = {Theory and applications of categories},
     pages = {164--168},
     publisher = {mathdoc},
     volume = {13},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2004_13_a9/}
}