Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1970_8_6_a4, author = {V. A. Liskovets}, title = {The number of strongly connected directed graphs}, journal = {Matemati\v{c}eskie zametki}, pages = {721--732}, publisher = {mathdoc}, volume = {8}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a4/} }
V. A. Liskovets. The number of strongly connected directed graphs. Matematičeskie zametki, Tome 8 (1970) no. 6, pp. 721-732. http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a4/