Ken E. Giller, Jens A. Andersson, Marc Corbeels, John Kirkegaard, David Mortensen, Olaf Erenstein & Bernard Vanlauwe. 2015. Frontiers in Plant Science: Agroecology and Land Use Systems. Published: 28 October 2015. Volume 6 Article 870.

http://dx.doi.org/10.3389/fpls.2015.00870