TY  - BOOK
T1  - From sundials to atomic clocks : understanding time and frequency
A1  - Jespersen, James
A2  - Fitz-Randolph, Jane
LA  - English
PP  - Gaithesburgh
PB  - U.S.Department of Commerce
YR  - 1999
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dfi.4617
OP  - 308
KW  - TIEMPO
KW  - RELOJES
ER  -