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G. Dospinescu, M. Lascu, C. Pohoata & M. Letiva, "An elementary proof of Blundon's inequality", Journal of inequalities in pure and applied mathematics, vol. 9, iss. 4, 2008, [3]Archived 2016-03-03 at the वेबैक मशीन
Cam McLeman & Andrei Ismail, "Weizenbock's inequality", PlanetMath, [4]Archived 2012-02-18 at the वेबैक मशीन.