TY  - BOOK
AU  - Opik,Ernst J.
TI  - Interplanetary encounters: close-range gravitational interactions 
SN  - 0444413715 :
U1  - 521.54 
PY  - 1976///
CY  - Amsterdam
PB  - Elsevier Scientific Pub.
KW  - Celestial mechanics
KW  - Gravitation
KW  - Planets
KW  - Orbits
N1  - Includes bibliographical references and index
ER  -