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Lacques, Gabe. “MLB to Test Automated Strike Zone – a Step toward 'Robot Umpires' – during Spring Training.” USA Today, Gannett Satellite Information Network, 21 Feb. 2020, www.usatoday.com/story/sports/mlb/2020/02/21/mlb-to-test-robot-umpires-in-spring-training/4830417002/.
