Padmakar V. Khadikar, Narayan V. Deshpande, Prabhakar P. Kale, Andrey A. Dobrynin, Ivan Gutman, Gyula Domotor. The Szeged Index and an Analogy with the Wiener Index. Journal of Chemical Information and Computer Sciences, 35(3):547-550, 1995.
Abstract is missing.