1. Gaydon, A. G., and Penney, W. G., Proc. Roy. Soc., A, 183, 374 (1945). Herzberg, G., Chem. Rev., 20, 145 (1937). Schmid, R., and Gerö, L., Z. Phys., 105, 36 (1937). These papers discuss the arguments in favour of each of the values quoted as well as those against the intermediate possible values of 8.4 and 9.6 eV.
2. Goldfinger, P., and Jeunehomme, W., Trans. Farad. Soc., 32, 1591 (1936).
3. Ribaud, G., and Bégue, J., C.R. Acad. Sci. Paris, 221, 73 (1945). Their values for the vapour pressure of carbon are too high for Lc = 170 but too low for Lc = 124 kcal.
4. Goldfinger, P., Lasareff, W., and Rosen, B., C.R. Acad. Sci. Paris, 201, 958 (1935).
5. Mulliken, R. S., and Rieke, C. A., Rev. Mod. Phys., 14, 259 (1942).