Aleksander Maziarz, Which authority is competent to decide when a power company is abusing monopolistic power : the President of the UOKiK or the President of the URE? : case comment to the judgement of the Supreme Court of April 2, 2009 - ENION S.A. (Ref. No. III SK 36/08) , Yearbook of Antitrust and Regulatory Studies, 2011, 4 (4), , s. 225-229