Robinson, R A; Butterfield, D M; Andrews, A S; Odesola, L R (1999) Ambient Hydrocarbon Air Quality Monitoring Network: 1998 Audit Report. NPL Report. COEM 35
Andrews, A S; Butterfield, D M; Robinson, R A; Odesola, L R (1999) Summary of UK Ambient Hydrocarbon Air Quality Network operations during 1998. NPL Report. COEM 36