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WikiPedia: Vụ mất tích của Frederick Valentich http://www.csicop.org/si/show/the_valentich_disapp... https://news.google.com/newspapers?nid=1350&dat=19... https://news.google.com/newspapers?nid=2245&dat=19... https://news.google.com/newspapers?nid=860&dat=197... http://www.adelaidenow.com.au/truth-was-out-there-... https://archive.org/details/ufobookencyclope0000cl... https://books.google.com/books?id=jT5juKHRdwIC&pg=... https://commons.wikimedia.org/wiki/Category:V%E1%B... http://recordsearch.naa.gov.au/SearchNRetrieve/Int... http://recordsearch.naa.gov.au/NAAMedia/ShowImage....