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WikiPedia: Sự_kiện_UFO_trường_Ariel //pubmed.ncbi.nlm.nih.gov/23448000 //www.ncbi.nlm.nih.gov/pmc/articles/PMC3588562 http://www.csicop.org/specialarticles/show/klass_f... https://www.barstoolsports.com/podcast/3372254/zah... https://www.bbc.com/news/av/stories-57749238 https://www.expressnews.com/entertainment/movies-t... https://books.google.com/books?id=0UUUAQAAIAAJ https://imgur.com/gallery/yALWO9S https://www.inquisitr.com/3275225/zimbabwe-ufo-mas... https://www.news24.com/witness/archive/The-day-the...