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This is a list of alleged entities reportedly witnessed, encountered or speculated to be associated with UFOs. UFOs are apparent flying objects which cannot be identified in terms of known human creations or natural phenomena even after rigorous attempts at identification. The description of many of these UFOs as resembling flying machines with capabilities far greater than publicly known human technology has fueled speculation that some UFOs are spacecraft piloted by extraterrestrials.
While this extraterrestrial hypothesis has seen some support among the general public, some paranormal researchers have postulated extra-dimensional, psychical or religious explanations for their origin. Mainstream scientists regard the study of UFOs and related subjects to be pseudoscience
Bryan, C.D.B (1995). Close Encounters of the Fourth Kind. Alfred A. Knopf, Inc. ISBN B000I1AFBA.
Carlson, Peter (February 19, 2004). "Ike and the Alien Ambassadors". Washington Post. Retrieved 2007-03-30. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
Gilliland, James (2001). "In the Beginning...". Reunion with Source. Hood River, Oregon: Self-Mastery Earth Institute. pp. 24–27. ISBN09658713-2-0.
Carlson, Peter (February 19, 2004). "Ike and the Alien Ambassadors". Washington Post. Retrieved 2007-03-30. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
Lewis, Judith (April 5, 2000). "Get a Piece of the Rock". LA Weekly. Retrieved Nov. 15, 2008. {{cite web}}: Check date values in: |accessdate= (help)
Bryan, C.D.B (1995). Close Encounters of the Fourth Kind. Alfred A. Knopf, Inc. ISBN B000I1AFBA.
Carlson, Peter (February 19, 2004). "Ike and the Alien Ambassadors". Washington Post. Retrieved 2007-03-30. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
Däniken, Erich von. Gods from Outer Space. New York: Putnam, 1968, OCLC 12558926
Carlson, Peter (February 19, 2004). "Ike and the Alien Ambassadors". Washington Post. Retrieved 2007-03-30. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
Lewis, Judith (April 5, 2000). "Get a Piece of the Rock". LA Weekly. Retrieved Nov. 15, 2008. {{cite web}}: Check date values in: |accessdate= (help)