@article{DA_2012_19_4_a3,
     author = {V. A. Voblyi},
     title = {A formula for the number of labeled connected graphs},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {48--59},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2012_19_4_a3/}
}