1. Kgl. Danske Videnskab. Sels. Matfyz. Medd. 12;N. Bohr,1933
2. Boltzmann, L., 1904, Vorlesungen über die Prinzipien der. Mechanik, Vol. II, Wien. This paper and its intellectual antecedents are discussed in a recent paper by Dr, S. Wagner (1981) whom I thank for his communication on this point.
3. Christodoulou, D., 1970, “Reversible and irreversible transformations in black-hole physics,” Phys. Rev. Lett. 25, 1596–1597.
4. Cordero, P., and C. Teitelboim, 1978, “Remarks on supersymmetric black holes,” Phys. Lett. 78B, 80–83.
5. special issue of Contribuciones Cientificas y technologicas;P. Cordero,1978