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Major oil producers that filed for bankruptcy in the downturn have recovered
Recapitalising balance sheets may not be enough to save some companies
Three coal companies have filed for bankruptcy in six months
US energy sector’s rising levels of distressed debt track oil’s plunge and rising cost of capital
Falling oil prices put groups with high costs under severe financial strain
KKR-led group that bought out Oklahoma oil producer in 2011 to lose $4bn investment
International Edition