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Proton Proton (họ tên lửa) Protoceratops Protohadros Protodioscin ProtonVPN Prototype (Framework JavaScript) Protoplanet Prototype (công ty) Protolampra brunneicollisTài liệu tham khảo
WikiPedia: Protoplanet http://dsc.discovery.com/space/big-pic/hubble-pall... http://news.discovery.com/space/asteroid-protoplan... http://cosmiclog.msnbc.msn.com/archive/2009/10/08/... http://tech.groups.yahoo.com/group/mpml/message/25... http://adsabs.harvard.edu/abs/2000Icar..144...27K http://www.nasa.gov/press-release/nasa-selects-inv... //dx.doi.org/10.1006%2Ficar.1999.6266 http://www.eso.org/public/news/eso1310/