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Ultras Ultrasurf Ultrasonic motor Ultrasauros Ultra Super Pictures Ultra Series Ultraman Zero Ultraman (nhân vật) Ultra Music Festival Ultraman Trigger: New Generation TigaTài liệu tham khảo
WikiPedia: Ultras http://inbedwithmaradona.com/journal/2010/11/2/we-... http://www.informaworld.com/smpp/content~db=all~co... http://www.torcida.hr/index.php?option=com_content... http://www.football-italia.net/blogs/si60.html http://www.asromaultras.org/as_roma_ultras.html http://www.asromaultras.org/gruppi.html http://www.guardian.co.uk/football/2007/feb/04/new... http://www.wsc.co.uk/content/view/196/29/ https://web.archive.org/web/20110217032145/http://... https://web.archive.org/web/20110713024313/http://...