@ARTICLE {GRINGS:2010c,
title = {Enriching livestock diets with cowpea},
author = {Grings, E. E. },
journal = {R4D review},
year = {2010},
month = {September},
volume = {5},
pages = {20--21},
issn = {2071-3681},
url = {http://r4dreview.org/},
}