‎"EHRENFEST, P. (+) H. K. ONNES.‎
‎Vereinfachte Ableitung der kombinatorischen Formel, welche der Planckschen Strahlungstheorie zugrunde liegt.‎

‎Leipzig, Barth, 1915. 8vo. In full cloth with gilt lettering to spine. In ""Annalen der Physik"", Vierte Folge, Band 46. Entire volume offered. Library labels pasted on the pasted down front free end paper. Traces after a label to lower part of spine. Stamp to title page. Internally fine and clean. Pp. 1021-24. [Entire volume: VIII, 1152 pp.].‎

Reference : 50329

‎First appearance of Ehrenfest and Onnes' important paper in which they explained ""with ultimate clarity"" (Balashov, Einstein Studies in Russia) Planck's law and combinatorics. ‎