Garrett, Kristina C.; Hummel, Kristen (2004), "A combinatorial proof of the sum of q-cubes", Electronic Journal of Combinatorics, 11 (1), Research Paper 9, MR 2034423.
Garrett، Kristina C.؛ Hummel، Kristen (2004)، "A combinatorial proof of the sum of q-cubes"، Electronic Journal of Combinatorics، 11 (1)، Research Paper 9، MR 2034423 .