@article{PIM_1994_N_S_56_70_a2,
     author = {A. Dobrynin and Ivan Gutman},
     title = {On a {Graph} {Invariant} {Related} to the sum of all {Distances} in a {Graph}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {18 },
     publisher = {mathdoc},
     volume = {_N_S_56},
     number = {70},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1994_N_S_56_70_a2/}
}