Analysis of information sources in references of the Wikipedia article "Penalty area" in English language version.
Other research has examined the position on the pitch from which goals are scored. In a recent study Wright et al. (50) showed that from 167 goals from English Premier League, 87% of goals were scored inside the penalty area which is similar to the 90% observed by Olsen (36) for the 1986 World Cup whereas Dufour (14) reported 80% for the 1990 World Cup. Yiannakos and Armatas (51) reported that 44.4% of goals scored were inside the penalty area, 35.2% inside the goal area, and 20.4% outside the penalty area, for the 2004 European Championship in Portugal. Finally, Hughes et al. (22) showed that successful teams in the 1986 Football World Cup made more attempts inside the penalty area in comparison to unsuccessful teams.
