The fact
Barcelona has appealed to UEFA over a Laws of Game failure in its earlier elimination, a complaint already rejected by the governing body.
These matches promise intense competitive clashes between the competition's favorites as they bid for a spot in the final.
2 sources — click a link to read an article on the topic:
Story timeline
Apr 15Arsenal reach Champions League semi-finals despite Arteta’s criticism of lackluster performance
Apr 16Champions League: four semi-finals between European powerhousesthis article