1. A. P. Ivanov, op. cit. (Chap. I, ref. 4).
2. C. Fabry, op. cit. (Chap. I, ref. 3).
3. P. A. Apanasevich et al., op. cit. (Chap. II, ref. 4).
4. M. A. Bramson, tabular section of this volume (cf. Chap. I, ref. 8).
5. A. N. Lowan and G. Blanch, “Tables of Planck’s radiation and photon functions,” J. opt. Soc. Am., 30: 70–81 (1940).