One Out From Perfect Game, Tigers Pitcher Is Thwarted by Umpire's Call - The New York Times
Don Denkinger, 86, Top Umpire Remembered for Botched Call, Dies - The New York Times
Umpires fire back at Max Scherzer: Hand 'far stickier than anything that we've felt
Dale Sveum says check-swing call by umpire Phil Cuzzi 'Easily the worst I've ever seen' - Yahoo Sports
MLB: Umpire Hernández blew calls, losing World Series job
What is a strike in baseball? Robots, rule book and umpires view it differently
Steal first base? Robot umpires? Gauging reaction to the Atlantic League's experimental rules – The Morning Call
Umpire Position With A Runner on First
The ROOTS of Honoring the Game – How to Challenge a Call by an Official - PCA
Umpires Are Less Blind Than They Used To Be
Are robot umpires ready for their MLB debut? Not so fast. - The Athletic
Making the Call: Your Decision to Umpire - Little League
