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WikiPedia: Objek berpotensi berbahaya http://andrew-lowe.ca/ALL-PHAS.HTM#Earth http://www.brera.mi.astro.it/sormano/mbpl.html http://www.brera.mi.astro.it/sormano/teca.html http://www.nss.org/resources/library/planetarydefe... http://swfound.org/media/16114/iac-10.e3.1b.4.pdf https://blogs.scientificamerican.com/observations/... https://cneos.jpl.nasa.gov/about/neo_groups.html https://cneos.jpl.nasa.gov/sentry/ https://web.archive.org/web/20161210142717/http://...