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International Football Association Board | IFAB
Referee Quotes. QuotesGram
World Cup and VAR: Why FIFA referees are making TV box signal with their hands during Russia 2018 games - CBSSports.com
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International Football Association Board | IFAB
The IFAB on Twitter: "What is the difference between use of VAR 'check' and 'review' signal? CHECK: referee stops play by pointing finger to ear and extending other hand/arm to communicate with
23 Football Referee Signals With Images and What They Mean - HubPages
Circular 13_2018_v0.2_EN_18-01444_902_EN_DE
Official Football Signals
Referee Signals - YouTube
Players making VAR review 'TV signal' will be booked as system enters law book