@article{00721223,
title = {Counting two-graphs related to trees.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {2},
year = {1995},
zbl = {0810.05031},
language = {en},
url = {http://dml.mathdoc.fr/item/00721223}
}
Cameron, Peter J. Counting two-graphs related to trees.. The Electronic Journal of Combinatorics [electronic only], Tome 2 (1995) . http://gdmltest.u-ga.fr/item/00721223/