@article{00809164,
title = {On a graph invariant related to the sum of all distances in a graph.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {55(69)},
year = {1994},
pages = {18-22},
zbl = {0831.05026},
language = {en},
url = {http://dml.mathdoc.fr/item/00809164}
}
Dobrynin, A.; Gutman, I. On a graph invariant related to the sum of all distances in a graph.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 55(69) (1994) pp. 18-22. http://gdmltest.u-ga.fr/item/00809164/