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Gijsman, AJ ,  Oberson, Astrid ,  Tiessen, H. ,  Friesen, Dennis K. ,  [A cautionary note about the use of the CENTURY soil-organic-matter model for ecosystems on highly-weathered tropical low-P soils] ,  A cautionary note about the use of the CENTURY soil-organic-matter model for ecosystems on highly-weathered tropical low-P soils

Mutegi, R ,  Ferguson, Morag E. ,  Maass, Brigitte L. ,  Tiessen, H. ,  Mkamilo, G.S. ,  Kamau, J ,  Adjebeng-Danquah, J ,  Alves, A.A.C. ,  Setter, TL ,  Fregene, Martin A. ,  [Field evaluation of cassava varieties under drought stress in Kenya, Tanzania and Ghana] ,  Field evaluation of cassava varieties under drought stress in Kenya, Tanzania and Ghana

Oberson, Astrid ,  Friesen, Dennis K. ,  Tiessen, H. ,  Moir, JO ,  [Effects of improved pastures and phosphorus inputs on phosphorus transformations in a Colombian oxisol] ,  Effects of improved pastures and phosphorus inputs on phosphorus transformations in a Colombian oxisol