Harper, M R; Ridler, N M; Salter, M J (2012) A proposed standard for loss measurements on printed circuit boards. In: Proceedings of the 3rd Annual Seminar on Passive RF and Microwave Components., 26 March 2012, London, UK.

Salter, M J; Harper, M R; Ridler, N M (2008) Comparison between root-impulse-energy and vector network analyzer methods for measuring loss on printed circuit boards. In: 72nd ARFTG Microwave Measurement Conference Digest, 9-12 December 2008, Portland, OR, USA.

Bieler, M*; Seitz, S*; Spitzer, M*; Hein, G*; Pierz, K*; Siegner, U*; Basu, M A; Smith, A J A; Harper, M R (2007) Rise-time calibration of 50-GHz sampling oscilloscopes:intercomparison between PTB and NPL. IEEE Trans. Instrum. Meas., 56 (2). pp. 266-270.

Humphreys, D A; Harper, M R; Smith, A J A; Smith, I M (2005) Vector calibration of optical reference receivers using a frequency-domain method. IEEE Trans. Instrum. Meas., 54 (2). pp. 894-897.

Harper, M R; Smith, A J A; Basu, A; Humphreys, D A (2004) Calibration of a 70 GHz oscilloscope. In: Conference on Precision Electromagnetic Measurements (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Smith, A J A; Harper, M R; Basu, A (2003) Progress in high-speed time domain metrology at NPL. In: 62nd ARFTG Microwave Measurement Conference, 4-5 December 2003, Boulder, USA.