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Who is your greatest football referee ever? For me, it is referee Pierluigi Collina of Italy! Today is his 62nd birthday! Happy birthday, the great one! : r/PremierLeague
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Howard Webb new referee performance director will select officials for Premier League matches - ESPN
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Pro soccer's first video-replay assisted penalty call came on Hilario Grajeda's watch, because of course it did - Once A Metro
Breaking down Goal-Line Technology - YouTube
How Much Do World Cup Referees Run During Matches?