Robert D. Blackwill, Plan B in Afghanistan - Why a De Facto Partition Is the Least Bad Option - More, Foreign Affairs, at: http://www.foreignaffairs.com/articles/67026/robert-d-blackwill/plan-b-in-afghanistan --- Opinion: A de facto partition for Afghanistan - Robert D. Blackwill - More, POLITICO, at: http://www.politico.com/news/stories/0710/39432.html