TY  - BOOK
AU  - Rees,Martin J.
AU  - Hawking,Stephen
TI  - Before the beginning: our universe and others 
T2  - Helix books
SN  - 0201151421
AV  - QB981 R427
U1  - 523.1 21
PY  - 1997///
CY  - Reading, Massachusetts
PB  - Addison-Wesley
KW  - Cosmología
N1  - Includes bibliographical references (p. 281-282) and index
ER  -