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Refereeing at the World Cup explained: Match officials, VAR, offside technology and more - The Athletic
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
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Recife, Brazil. 26th June, 2014. Referee Ravshan Irmatov of Uzbekistan gestures during the FIFA World Cup group G preliminary round match between the USA and Germany at Arena Pernambuco in Recife, Brazil,
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