Why are there still umpires in Major League Baseball? Why can't it all be automated? - Quora
Robot Umpires Strike Zone: It's Not as Simple as You ThinkBaseball Prospectus
Point/Counterpoint: Is it Time For Robot Umpires in Baseball? - The Heights
Baseball replay: Major League Baseball's new system ensures that bad calls will still get made for absolutely no reason.
Jason Gay: World Cup Needs Instant Replay Badly - WSJ
MLB's PitchCom System Draws Mixed Reactions - The New York Times
Electronic Strike Zone is coming to MLB, and hitters are going to HATE it
Will MLB Ever Have the Guts to Suspend Umpires for Brutal Judgment Calls?, News, Scores, Highlights, Stats, and Rumors
MLB's robot umpires may soon change baseball forever - Sports Illustrated