‘Anwendung der Quantenmechanik auf das Problem der anomalen Zeemaneffekte,’ pp. 263-277 in Zeitschrift fur Physik 37 Band, 4/5 Heft, 5 May 1926.
Berlin: Springer, 1926. First edition of the explanation of the anomalous Zeeman effect on the basis of matrix mechanics. “By including the spin property of the electron, Heisenberg and Jordan obtained perhaps the greatest triumph of matrix mechanics: they were able to derive all observed phenomena connected with the anomalous..... More