@INBOOK {SMITH:2013a, title = {Challenges for the improvement of seed systems for vegetatively propagated crops in Eastern Africa}, author = {Smith, J. and Coyne, D. and Schulte-Geldermann, E. }, year = {2013}, edition = {1}, pages = {105--114}, chapter = {8}, publisher = {Routledge}, address = {Oxon, Uk}, isbn = {978-0415532730}, note = {In: Vanlauwe, B., Van Asten, P. and Blomme, G. (Eds), 2013. Agro-Ecological Intensification of Agricultural Systems in the African Highlands. EAHub;}, }