A form of debt restructuring rather than outright forgiveness should enable Greece to handle its “unviable” debt burden, the head of the International Monetary Fund was quoted as telling a Swiss newspaper. The IMF has yet to make clear if it will participate in the third 86-billion-euro ($96 billion) international bailout that Greece signed up to in early August, having argued in favor of a partial writedown of a debt burden it considers unsustainable in its current form.