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Otoo, M. ,  Ryan, J. E. H. ,  Drechsel, Pay ,  [Where there's muck there's money: reinventing the economics of sanitation.] ,  Where there's muck there's money: reinventing the economics of sanitation.

Otoo, M. ,  Ibro, G. ,  Fulton, J. ,  Lowenberg-Deboer, J. ,  [Micro-entrepreneurship in Niger: factors affecting the success of women street food vendors.] ,  Micro-entrepreneurship in Niger: factors affecting the success of women street food vendors.