The Sport Information Resource Centre
Use double quotes to find documents that include the exact phrase: "aerodynamic AND testing"
The Sport Information Resource Centre

Increased hooliganism and soccer-related violence are legitimate international concerns. Previous research has linked sports-related hooliganism to ‘social maladjustment’ (e.g. previous episodes of violence or dysfunctional behavior at home, work or school), however new research suggests incidents are linked to social bonding and a desire to protect and defend other fans.