TY  - RPRT
TI  - Europa exploration: challenges and solutions
AU  - Johnson, Torrence V.
AU  - Clark, Karla
AU  - Greeley, Ron
AU  - Pappalardo, Robert
PY  - 2002
UR  - https://ntrs.nasa.gov/citations/20060044207
ID  - 20060044207
ER  -