@INBOOK {JOHNSON:2005,
title = {The impact of IARC genetic improvement programmes on cassava},
author = {Johnson, N. and Manyong, V. and Pachico, D. },
editor = {Evenson, R. and Gollin, D. },
year = {2003},
type = {Crop variety improvement and its effect on productivity: the impact of international agricultural research},
pages = {337--355},
publisher = {CABI},
address = {Wallingford, UK},
note = {RTB; Root and Tuber; Cassava},
}