TY  - BOOK
AU  - Einstein,Albert
AU  - Hentschel,Ann M.
AU  - Hentschel,Klaus
TI  - The Berlin years: correspondence, January 1919-April 1920 
T2  - The collected papers of Albert Einstein
SN  - 0691121249
AV  - QC16.E5 E553
PY  - 2004///
CY  - Princeton, New Jersey
PB  - Princeton University Press
KW  - Einstein, Albert,
KW  - Físicos
KW  - Biografía
ER  -