Andrews, A S; Brand, J; Butterfield, D M; Gee, R M (2001) UK ambient hydrocarbon air quality network: 2000 audit report. NPL Report. COEM 64
Andrews, A S; Brand, J; Butterfield, D M; Gee, R M (2001) Summary of UK ambient hydrocarbon air quality network operations during 2000. NPL Report. COEM 61