Klein, Douglas J. (2002). "Resistance-Distance Sum Rules"(PDF). Croatica Chemica Acta. 75 (2): 633–649. Archived from the original(PDF) on 10 June 2007. Retrieved 30 September 2006.
Klein, Douglas J. (2002). "Resistance-Distance Sum Rules"(PDF). Croatica Chemica Acta. 75 (2): 633–649. Archived from the original(PDF) on 10 June 2007. Retrieved 30 September 2006.