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

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.