Report/Guide

O'Halloran, J (1999) A bilateral intercomparison of disseminated transmittance standards. NPL Report. COEM 40

Verrill, J F; Clarke, P J; O'Halloran, J (1997) Study of improved methods for Absolute Colorimetry. Fifth report - study of colorimetric errors on industrial instruments. NPL Report. COEM 2

Verrill, J F; Clarke, P J; O'Halloran, J; Knee, P C (1995) NPL Spectrophotometry and Colorimetry club. Intercomparison of colour measurements. NPL Report. QU 113

Article

Verrill, J F; Knee, P C; O'Halloran, J (1995) A study of the uniformity and thermochromism of surface colour standards. Commission Internationale de L'eclairage Cie X, 119. pp. 95-96.