Williams, J M; Henderson, D; Pickering, J*; Behr, R*; Muller, F*; Scheibenreiter, P* (2011) Quantum referenced voltage waveform synthesizer. IET Sci. Meas. Technol., 5 (5). pp. 163-174.

Kibble, B P; Williams, J M; Jones, R G; Cook, J*; Crisp, P*; Knight, B*; Pickering, J*; Skinner, D* (2003) A guide to measuring direct and alternating current and voltage below 1 MHz. Technical Report. Institute of Measurement and Control / National Physical Laboratory.

Pickering, J*; Thompson, R; Williams, J M (1999) A new compact isolated power supply for electrical metrology at low signal levels. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.