TY  - RPRT
TI  - The extraordinary radar echoes from Europa, Ganymede, and Callisto: A geological perspective
AU  - S.J. Ostro
AU  - E.M. Shoemaker
PY  - 1990
DO  - 10.1016/0019-1035(90)90121-o
UR  - https://pubs.usgs.gov/publication/70016218
ID  - 70016218
ER  -