Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1961__143_160854, author = {R.C. READ}, title = {A note on the number of functional digraphs.}, journal = {Mathematische Annalen}, pages = {109--110}, publisher = {mathdoc}, volume = {143}, year = {1961}, zbl = {0096.38201}, url = {http://geodesic.mathdoc.fr/item/MAN_1961__143_160854/} }
R.C. READ. A note on the number of functional digraphs.. Mathematische Annalen, Tome 143 (1961), pp. 109-110. http://geodesic.mathdoc.fr/item/MAN_1961__143_160854/