TY  - BOOK
AU  - 
AU  - Walter, Ulrich
TI  - Astronautics: the physics of space flight
SN  - 9783527410354
U1  - 629.4 
PY  - 2012///
CY  - Weinheim
PB  - Wiley-Vch
KW  - Gravitational field
KW  - Rocket power
ER  -