@ARTICLE {LEGG:2011, title = {Developing clean seed systems for cassava in East and Central Africa}, author = {Legg, J. }, journal = {R4D Review}, year = {2011}, month = {March}, volume = {6}, pages = {41--45}, issn = {2071-3681}, note = {RTB; Root and Tuber; Cassava}, url = {http://r4dreview.org/wp-content/uploads/2011/05/mar2011_low_res.pdf}, }