Takeshima, Hiroyuki et al. “Impact of Fertilizer Subsidies on the Commercial Fertilizer Sector in Nigeria: Evidence from Previous Fertilizer Subsidy Schemes,” NSSP Working Paper 23 (IFPRI 2013). http://ebrary.ifpri.org/cdm/singleitem/collection/p15738coll2/id/127318/rec/2

http://nssp.ifpri.info/2013/01/17/5299/