@article{JIS_2003__6_1_a7,
     author = {Hassani, Mehdi},
     title = {Derangements and applications},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2003__6_1_a7/}
}