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 Australia's ASX building is seen in central Sydney October 25, 2010. Singapore Exchange (SGX) unveiled an agreed $8.3 billion takeover offer for Sydney-based ASX Ltd on Monday to create the fifth-largest listed exchange in the world. REUTERS/Daniel Munoz (AUSTRALIA - Tags: BUSINESS)

Roc shareholder disputes merger

Australia’s investment house Allan Gray is disputing the legitimacy of the decision-making process in the merger between Roc Oil and Horizon Oil, calling for an extraordinary general meeting.