1. V. V. Babushkin et al., Izmer. Tekh., No. 2, 24 (1981).
2. V. V. Babushkin, I. I. Dolgikh, and I. V. Libova, ?The present state of infrared radiometry and its metrological servicing,? Review Information, Ser. Metrolog. Obespech. Izmer., No. 1, Moscow (1983).
3. J. Bonhoure, Revue Générale de l'Éléctricité,78, No. 11, 1001 (1969).
4. E. Gillham, Proc. R. Soc., London, Ser. A,269, 249?276 (1962).
5. C. A. Hamilton, G. W. Day, and R. I. Phelan, NBS Technical Note 678, March (1976).