Referees also should enforce the hockey rules .
Referees also punish more strictly especially in head checks , high sticks , and checks from behind ( Biasca et al. 2002 ) , which are the most common illegal causes of injuries .
Referees also should enforce the hockey rules and punish more strictly especially in head checks , high sticks , and checks from behind ( Biasca et al. 2002 ) , which are the most common illegal causes of injuries .