Lanctot, B., R. Panneton, and N. Atalla. “Errors and Uncertainties of Classical Standing Wave Tube Methods: SWR, TMTC and TMTM”. Canadian Acoustics, vol. 28, no. 3, Sept. 2000, pp. 86-87, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1302.