An Observational Upper Limit on the Interstellar Number Density of Asteroids and Comets
Journal article published in 2017 by
Toni Engelhardt,
Robert Jedicke,
Peter Vereš,
Alan Fitzsimmons 
,
Larry Denneau,
Ed Beshore,
Bonnie Meinke
,
Larry Denneau,
Ed Beshore,
Bonnie Meinke
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