@article{DMTCS_2007_10_2_a1,
     author = {Callan, David},
     title = {A determinant of {Stirling} cycle numbers counts unlabeled acyclic single-source automata},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2007-2008},
     doi = {10.46298/dmtcs.421},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.421/}
}