@article{JIS_2008__11_3_a3,
     author = {Callan,  David},
     title = {A combinatorial interpretation for an identity of {Barrucand}},
     journal = {Journal of integer sequences},
     year = {2008},
     volume = {11},
     number = {3},
     zbl = {1148.05006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2008__11_3_a3/}
}