Genetic diversity in Napier grass (Pennisetum purpureum) cultivars: Implications for breeding and conservation - Bramwel W.; Wanjala, Bramwel W.; Obonyo, M.; Wachira, F.N.; Muchugi, A.; Mulaa, M.; Harvey, Jagger J.W.; Skilton, Robert A.; Proud, J.; Hanson, Jean (Oxford University Press, 2013)