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Brazil´s President Dilma Rousseff must assume her share of responsibility for the controversial purchase of a refinery in Texas by Petroleo Brasileiro SA, the former chief executive of the state-run oil company said in an interview published on Sunday. Rousseff chaired the board of Petrobras in 2006 when it approved the purchase of Pasadena Refining System Inc, near Houston. Its high cost and losses later incurred at the refinery have put Petrobras at the center of a growing political scandal that began with bribery accusations and was fanned by the arrest of a former director in connection with a money-laundering case. The fall-out could complicate a re-election bid in October by Rousseff, who has said she was not informed of two clauses in the refinery contract that made it an onerous deal for Petrobras.