425. “Remark on P. Jordan’s Paper ‘On the Theory of Quantum Radiation’” “Bemerkung zu P. Jordans Abhandlung „Zur Theorie der Quantenstrahlung“” [Einstein 1925o] Received 22 January 1925 Published February-April 1925 In: Zeitschrift für Physik 31 (1925): 784–785.