International comparison of power measurements at 33 GHz (GT-RF/92-4). - Joseph Achkar; Laurent Velasco; M. P. Weidman; Richard F. Clark; Jeong-Hwan Kim; Jeong-Il Park; Tieren Zhang; John E. Peters; Jürgen Rühaak; Dieter Stumpe; Jan P. M. de Vreede; A. M. Wallace (IEEE Trans. Instrum. Meas., 1999)

International comparison for RF power in the frequency range up to 18 GHz. - Jan P. M. de Vreede; Willemien Korfage; Patrik Persson; Luciano Brunetti; Valentin Lopez; Ivan Petras; Pierre Morard; Frantisek Hejsek; Andras Török; Jürgen Rühaak; John Ascroft; Erik DressLer; et al. (IEEE Trans. Instrum. Meas., 2001)