This study is the first to investigate whether the introduction of additional assistant referees in the UEFA Europa League (2009-2010 season) and the UEFA Champions League (2010-2011 season) was associated with lower referee bias in terms of home and "big" team favouritism. To this end. we analyse a unique database with pre- and within-game characteristics of all games in seven recent... https://stilleners.shop/product-category/license-plate-bracket-hardware-kit/