KLAVŽAR, Sandi in GUTMAN, Ivan, 2006, A theorem on Wiener-type invariants for isometric subgraphs of hypercubes. Applied Mathematics Letters [na spletu]. 2006. Vol. 19, no. 10, p. 1129–1133. [Dostopano 31 marec 2025]. Pridobljeno s: http://dx.doi.org/10.1016/j.aml.2005.12.004