Downs, M J; Birch, K P; Cox, M G; Nunn, J W (1995) Verification of a polarization-insensitive optical interferometer system with subnanometric capability. Precision Engineering, 17 (2). 84 - 88

Allison, J M*; Birch, K P; Crowder, J G* (1994) Precise determination of refractometric parameters for anesthetic agent vapors. Appl. Opt., 33 (13). 2459 -2464

Allison, J M*; Birch, K P; Crowder, J G* (1994) The evaluation of interactions between anaesthetic agent vapours and carrier gases by laser refractometry. Phys. Med. Biol., 39 (4). 751 - 759

Downs, M J; Birch, K P; Cox, M G; Nunn, J W (1994) The verification of a polarisation insensitive optical interferometer system with subnanometric capability. European Optical Society Topical Meetings Digest, 4. pp. 10-11.

Birch, K P; Reinboth, F*; Ward, R E; Wilkening, G* (1993) The effect of variations in the refractive index of industrial air upon the uncertainty of precision length measurement. Metrologia, 30 (1). pp. 7-14.

Allison, J M*; Birch, K P; Crowder, J G* (1993) A measurement system for precise determination of the refractive indices of anaesthetic agent vapours. Mater. Sci. Technol., 4. pp. 571-577.

Birch, K P; Downs, M J (1993) An updated Edlen equation for the refractive index of air. Metrologia, 30 (3). pp. 155-162.