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Hertzum, M., & Jacobsen, N. E. (2001). The evaluator effect: A chilling fact about usability evaluation methods. International Journal of Human-Computer Interaction, 13, 4, 421-443.
PDF: http://www.akira.ruc.dk/~mhz/Research/Publ/IJHCI2001_preprint.pdf
To correct some typesetting errors in the formulas, reprinted in 15, 1, 183-204.