1. International Commission on Illumination: “International Lighting Vocabulary”, 3rd ed. Paris 1970 [Publication n 17(E-1-1))].
2. Jacques, J.A. and Kuppenheim, H.F., 1955, Spectral reflectance of the human skin in the region 0.7-2.6 μm, J.Appl.Physiol, 8: 305.
3. Hardy, J.D., 1956, Spectral reflectance and transmittance of excised human skin, J.Appl.Physiol, 9: 257.
4. Ebaugh, F.G.J. and Thauer, R., 1950, Influence of various environmental temperature on cold and warmth thresholds, J.Appl.Physiol, 8: 173.
5. Hardy, J.D., Goodell, H., and Wolff, H.G, 1951, Influence of skin temperature upon pain threshold as evoked by thermal radiation, Science, 114: 149, 1951.