| The UEFA Europa League evolved from the UEFA Cup, which itself was conceived by Switzerland's Ernst Thommen, along with Italy's Ottorino Barrasi and England's Sir Stanley Rous | Magnani, Loris; Stokkermans, Karel 30 April 2005 |
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| Union of European Football Associations UEFA | London: Guardian News and Media |
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| One of the final changes takes place in 2006, when the crest accrediting Real Madrid as the best Club of the 20th Century is added to the right side of the shirt | 25 de abril de 2016 |
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| Handbook on the economics of sport |
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