TY  - BOOK
AU  - Al-Khalili,Jim.
TI  - Black Holes,Worm Holes and Time Machines
SN  - 9781439885598
U1  - 530.11 
PY  - 2012///
CY  - Boca Roton.
PB  - CRC Press.
KW  - Cosmology-Space and Time
ER  -