A search for natural or artificial objects located at the Earth-Moon libration points

Observers
FREITAS,VALDES
Link
FULL PAPER
Reference
FREITAS, R.A. and VALDES, F., Icarus, 42, p. 442 (1980).
Comments

Attempt to discover evidence of discrete objects (such as interstellar probes) in stable orbits about L4, L5 by study of 90 photographic plates.