Williams, M B (2011) Gas measurement proficiency testing scheme round 2. NPL Report. AS 57

Williams, M B (2010) Calibration gas proficiency testing scheme round 5. NPL Report. AS 55

Williams, M B (2010) Calibration gas proficiency testing scheme round 5. NPL Report. AS 56

Williams, M B (2010) Particulate proficiency testing scheme, round 3 final report. NPL Report. AS 54

Williams, M B; Robinson, R A (2010) Gas measurement proficiency testing scheme, Round 1, Final Report. NPL Report. AS 47

Williams, M B; Robinson, R A (2009) Weighing proficiency testing scheme for the STA, round 2 final report (2nd Issue). NPL Report. AS 36

Williams, M B; Robinson, R A (2008) Weighing proficiency testing scheme for the STA. round 1 final report. NPL Report. AS 19