S.J. Patterson, D.S. Chanasyk, M.A. Naeth and E. Mapfumo
Canadian journal of Soil Sciences 89 ( 2 ): 223 - 234 , 2009
M.A. Behdani, E. Mapfumo, Z. Rengel and E.G. Barrett-Lennard
Journal of Biological Sciences 8 ( 6 ): 984 - 992 , 2008