10 Space Studies Board, National Research Council, Biological Contamination of Mars: Issues and Recommendations, National Academy Press, Washington, D.C., 1992, page 47.

11 D.L. DeVincenzi, P. Stabekis, and J. Barengoltz, “Refinement of Planetary Protection Policy for Mars Missions,” Advances in Space Research 18: 311, 1996.

12 COSPAR, Decision No. 1/94, COSPAR Information Bulletin 131, 1994, page 30.

13 National Aeronautics and Space Administration, Office of Space Science , Planetary Protection Provisions for Robotic Extraterrestrial Missions, NPG 8020.12B, Washington, D.C., 1999.

14 Viking '75 Project, Pre-launch Analysis of Probability of Planetary Contamination, Volumes II-A and II-B, M75-155-01 and M75-155-02, Jet Propulsion Laboratory, Pasadena, Calif., 1975.

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