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Science (New York, N.Y.)|December 11, 1976
Scientific results of the viking missionsG A Soffen
Applied Optics|January 15, 2010
Extraterrestrial optical microscopyG A Soffen
Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)|January 1, 1986
Is there a single origin of life?G A Soffen
Acta Astronautica|August 1, 1997
Astrobiology from exobiology: Viking and the current Mars probesG A Soffen
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