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TO THE READER Xlll

On references
Each chapter has its own set of references, which are marked in the text by a
square bracket containing a letter and a number. The following abbreviations
have been used for entries that occur frequently:
AdP: Annalen der Physik (Leipzig).
EB: Albert Einstein-Michele Besso Correspondance 1903-1955 (P. Speziali,
Ed.). Hermann, Paris, 1972.
PAW: Sitzungsberichte, Preussische Akademie der Wissenschaften.
Se: Carl Seelig, Albert Einstein. Europa Verlag, Zurich, 1960.