1. Sozialpolitische Schriften;Abbe,1921
2. The quantum theory of the emission and absorption of radiation;Dirac;Proc. R. Soc. Lond.,1927
3. Concerning an heuristic point of view toward the emission and transformation of light;Einstein;Am. J. Phys.,1905
4. On the Development of Our Views Concerning the Nature and Constitution of Radiation. Doc. 60;Einstein,1909
5. On the Present Status of the Radiation Problem;Einstein,1909