You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What FIFA World Cup did the referee of the 28 May 2011 football match at Wembley Stadium participate in?" whose answer is 2010 FIFA World Cup.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Referee of the 2011 UEFA Champions League final
Useful Output:

Doc 1: Only Real wins: Frenchman Turpin to referee CL final against Liverpool · Referee: Clément Turpin (France) · Linesman: Nicolas Danos, Cyril
Doc 2: Marciniak began his career as a professional referee in 2006, taking charge of his first top-flight Polish league game in 2009.
Doc 3: OnThisDay 2006 Arsenal lose UCL final against Barcelona, Thierry Henry about referee after the game : " I think we can be proud of ourselves
Doc 4: Previous UEFA Champions League final referees ; 2010: Bayern München 0-2 Inter Milan – Howard Webb (ENG) ; 2011: Barcelona 3-1 Manchester United –
Doc 5: Cüneyt Çakır becomes the first Turkish referee to take charge of the UEFA Champions League when Juventus and FC Barcelona meet in Berlin.