1. Doc. Ophthalmol. Proc. Ser.;J Birch,1984
2. CIE. Recommendations on uniform color-spaces — Color difference equations — Psychometric color terms. Bureau Central CIE (1978).
3. Dain, S.J. and Birch, J. An averaging method for the interpretation of the Farnsworth-Munsell 100-Hue Test — I. Congenital colour vision defects. Ophthal. Physiol. Optics 7(3): 267–280 (1987).
4. Dain, S.J. and Birch, J. Comparison of methods of analysing the FM100-Hue Test. Amer. J. Optom. Physiol. Opt. 65(4): 254–262 (1988).
5. Dain, S.J., Pereira, S.M., Palmer, B., Lewis, P. and Hammond, T. Illuminance and the FM100 hue test. In: Verriest, G. (ed.), Colour Vision Deficiencies V. pp. 162–163. A. Hilger, Bristol (1980).