OSLO — Norwegian group Telenor met forecasts with a 4.7 percent rise in core first-quarter earnings and said it would keep its troubled investment in Russian operator VimpelCom. January-March earnings before interest, tax, depreciation and amortization rose to 7.40 billion kroner ($1.41 billion), compared with a forecast for 7.44 billion in a Reuters poll. Telenor repeated 2011 targets for organic revenue growth of above 5 percent and an […]