TY  - BOOK
AU  - Hawking, Stephen.
TI  - Challenge to impossible
SN  - 9789937944205
U1  - 530.092 
PY  - 2020///
CY  - Kathmandu
PB  - Trans world
KW  - Biographies
KW  - Hawking, Stephen, 1942-2018
KW  - Physicists
ER  -