[1] The COSPAR Workshop. Planetary protection policy [R]. Houston，Texas：World Space Council，2011.
[2] KMINEK G,CONLEY C,HIPKIN V,et al. COSPAR’s planetary protection policy[J]. Space Res Today,2017,200:12-25
[3] CYPSER DA. International law and policy of extraterrestrial planetary protection[J]. Jurimetrics,1993,33(2):315-339
[4] United Nations .RES 2222（XXI）-1967. The treaty on principles governing the activities of states in the exploration and use of outer space，including the Moon and other celestial bodies [S].USA：United Nations，1966.
[5] RUMMEL J D. Planetary protection policy(U.S.A.)[J]. Adv Space Res,1992,12(4):129-31
[6] DEBUS A. The European standard on planetary protection requirements[J]. Res Microbiol,2006,157(1):13-8
[7] AMMANN W，BARROS J，BENNETT A，et al. Mars sample return backward contamination – strategic advice and requirements - report from the ESF-ESSC study group on MSR planetary protection requirements [M]. K?ln-Porz，Germany：European Science Foundation，2012.
[8] PILLINGER J M,PILLINGER C T,SANCISIFREY S,et al. The microbiology of spacecraft hardware:lessons learned from the planetary protection activities on the beagle 2 spacecraft[J]. Res Microbiol,2006,157(1):19-24
[9] DOUGLAS E B,ROBERT D A,JENNIE R J,et al. Europa planetary protection for juno jupiter orbiter[J]. Adv Space Res,2013,52(3):547-568
[10] NASA. Mars atmosphere and volatile evolution（MAVEN）mission planetary protection implementation document，MAVEN-PM-PLAN-0115 [R]. Washington，DC：NASA，2012.
[11] DEVINCENZI D L,STABEKIS P,BARENGOLTZ J. Refinement of planetary protection policy for Mars missions[J]. Adv Space Res,1996,18(1–2):311
[12] RETTBERG，ANESIO P，BAKER A，et al. Review of the MEPAG report on Mars special regions [M]. Washington，DC，USA：National Academy Press，2015.
[13] RUMMEL J D,BEATY D W,JONES M A,et al. A new analysis of Mars “special regions”:findings of the second MEPAG Special Regions Science Analysis Group(SR-SAG2)[J]. Astrobiology,2014,14(11):887-968
[14] RETTBERG R,ANESIO A M,BAKER V R,et al. Planetary protection and Mars special regions—a suggestion for updating the definition[J]. Astrobiology,2016,16(2):119-25
[15] MELTZER M. When biospheres collide：a history of NASA's planetary protection programs [M]. Washington，DC，USA：NASA，2011.
[16] KAZARIANS G A，BENARDINI J N，STRICKER M C，et al. The Evolution of planetary protection implementation on Mars landed missions [C]. IEEE Aerospace Conference，Montana，USA，March 4-11，2017.
[17] MING D W，ARCHERPD J R，GLAVIN D P，et al. Volatile and organic compositions of sedimentary rocks in Yellowknife Bay，Gale Crater，Mars[J]. Science，2014，《Advances in space research ：the official journal of the Committee on Space Research（COSPAR）》，1992，12（4）：31-129.
[18] BARTHOLOMEW C S,PROTER D C. Reliability and sterilization[J]. J. Spacecraft,1966,3(12):1762
[19] The Viking Project Office. Viking project microbiological assay and monitoring plan，M75-148-0[R]. Washington，DC：NASA，1974.
[20] NASA. Post-launch report of compliance by Viking with COSPAR planetary quarantine recommendations[R]. Washington，DC：NASA，1975.
[21] CORLISS W R. The Viking mission to Mars，NASA SP-334[R]. Washington，DC：NASA SP-334，1974.
[22] HOLMBERG N A，FAUST R P，HOLT H M. Viking ’75 spacecraft design and test summary，volume I-lander design [R]. Washington，DC：NASA，1980.
[23] National Research Council. Biological contamination of Mars：issues and recommendations [M]. Washington，DC：National Academies Press，1992.
[24] BARENGOLTZ J,WITTE J. Planetary protection implementation on Mars reconnaissance orbiter mission[J]. Adv Sp Res,2008,42(6):1108-1119
[25] LUPISELLA M L，MUELLER T. Advanced technologies for robotic exploration leading to human exploration：results from the SpaceOps 2015 workshop [C]//International Conference on Space Operations. Daejeon，Korea：[s.n.]，2016.
[26] BONITZ R G,SHIRAISHI L R,MATTHEW A,et al. NASA Mars 2007 Phoenix lander robotic arm and icy soil acquisition device[J]. J. Geophys Res,2008,113:E00A01
[27] BENARDINI Ⅲ J N,LADUC M T,BALLOU D,et al. Implementing planetary protection on the atlas V fairing and ground systems used to launch the mars science laboratory[J]. Astrobiology,2014,14(1):33-41
[28] NASA.NPD8020.7 REV G W/CHG 1-1999，Biological contamination control for outbound and inbound planetary spacecraft[S].USA：NASA，1999.
[29] NASA.NPR8020.12D-2011，Planetary protection provisions for robotic extraterrestrial missions[S]. USA：NASA，2011.
[30] NASA. NPG 5340.1D-1999，NASA standard procedures for the microbiological examination of space hardware[S]. USA：NASA，1999.
[31] NASA. NASA-HDBK-6022.08-17-2010，Handbook for the microbial examination of space hardware[S]. USA：NASA，2010.
[32] HARRISON J P,GHEERAERT N,TSIGELNITSKIY D,et al. The limits for life under multiple extremes[J]. Trends Microbiol,2013,21(4):204-212
[33] STEVENSON A,CRAY J A,WILLIAMS J P,et al. Is there a common water-activity limit for the three domains of life?[J]. ISME J,2015,9(6):1333
[34] MOISSL-EICHINGER C,COCKELL C,RETTBERG P. Venturing into new realms? microorganisms in space[J]. FEMS Microbiol Rev,2016,40(5):722-37
[35] DERECHO I,MCCOY K B,VAISHAMPAYAN P,et al. Characterization of hydrogen peroxide resistant Acinetobacter species isolated during the Mars phoenix spacecraft assembly[J]. Astrobiology,2014,14(10):837-847
[36] SMITH S A,BENARDINI J N,ANDERL D,et al. Identification and characterization of early mission phase microorganisms residing on the Mars Science Laboratory and assessment of their potential to survive Mars-like conditions[J]. Astrobiology,2017,17(3):253-265
[37] VENKATESWARAN K,VAISHAMPAYAN P,BENARDINI J N,et al. Deposition of extremotolerant bacterial strains isolated during different phases of Phoenix Spacecraft assembly in a public culture collection[J]. Astrobiology,2014,14:24-26
[38] CHECINSKA A,PROBST AJ,VAISHAMPAYAN P,et al. Microbiomes of the dust particles collected from the International Space Station and Spacecraft Assembly Facilities[J]. Microbiome,2015,3(1):50-59
[39] ESA. ECSS-Q-ST-70-57C-2013，Dry heat bioburden reduction for flight hardware [S]. [S.l.]：ESA，2013.
[40] COBB T C. UV-C decontamination:NASA,prions,and future perspectives[J]. Appl Biosaf,2016,21(2):84-88
[41] STAPELMANN K,FIEBRANDT M,RAGUSE M,et al. Utilization of low-pressure plasma to inactivate bacterial spores on stainless steel screws[J]. Astrobiology,2013,13(7):597-606
[42] POTTAGE T,MACKEN S,GIRI K,et al. Low-temperature decontamination with hydrogen peroxide or chlorine dioxide for space applications[J]. Appl Environ Microbiol,2012,78(12):4169-4174
[43] ZEITLIN C,HASSLER D M,CUCINOTTA F A,et al. Measurements of energetic particle radiation in transit to Mars on the Mars science laboratory[J]. Science,2013,340(6136):1080-1084
[44] BEAUDET,ROBERT A. The statistical treatment implemented to obtain the planetary protection bioburdens for the Mars Science Laboratory mission[J]. Adv Space Res,2013,51(12):2261-2268
[45] BAUERMEISTER A,MAHNERT A,AUERBACH A,et al. Quantification of encapsulated bioburden in spacecraft polymer materials by cultivation-dependent and molecular methods[J]. PLoS One,2014,9(4):e94265
[46] MORRIS H C,MONACO L A,STEELE A,et al. Setting a standard:the limulus amebocyte lysate assay and the assessment of microbial contamination on spacecraft surfaces[J]. Astrobiology,2010,10(8):845-852
[47] HENRICKSON，R，LUNDGREN，P，MOHAN，G B M，et al. Comprehensive measurement of microbial burden in nutrient-deprived cleanrooms [C]//47th International Conference on Environmental Systems. Charleston，South Carolina：[s.n.]，2017.
[48] LA DUC M T,VAISHAMPAYAN P,NILSSON H R,et al. Pyrosequencing-derived bacterial,archaeal,and fungal diversity of spacecraft hardware destined for Mars[J]. Appl Environ Microbiol,2012,78(16):5912-5922
[49] HUGERTH L W,ANDERSSON A F. Analysing microbial community composition through amplicon sequencing:from sampling to hypothesis testing[J]. Front Microbiol,2017,8:1561
[50] BLAKKOLB B,LOGAN C,JANDURA L,et al. Organic cleanliness of the Mars Science Laboratory sample transfer chain[J]. Rev Sci Instrum,2014,85(7):251-261
[51] SUMMONS R E,SESSIONS A L,ALLWOOD A C,et al. Planning considerations related to the organic contamination of Martian samples and implications for the Mars 2020 Rover[J]. Astrobiology,2014,14(12):969-1027
[52] National Academies Press. Committee on preventing the forward contamination of Mars，National Research Council. preventing the forward contamination of Mars[M]. Washington，DC：National Academies Press，2006.
[53] MOISSL-EICHINGER C,AUERBACH A K,PROBST A J,et al. Quo vadis? microbial profiling revealed strong effects of cleanroom maintenance and routes of contamination in indoor environments[J]. Sci Rep,2015(5):9156
[54] ALEXANDER M,PARAG V,PROBST A J,et al. Cleanroom maintenance significantly reduces abundance but not diversity of indoor microbiomes[J]. PLoS One,2015,10(8):e0134848
[55] DEVINCENZI D L. Planetary protection issues and the future exploration of Mars[J]. Adv Space Res,1992,12(4):121-8
