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Henriet, J. ,  Ek, G.A. van ,  Blade, S. ,  Singh, B. ,  [Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: III. Importance of trees, shrubs and secondary crops in the cropping systems] ,  Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: III. Importance of trees, shrubs and secondary crops in the cropping systems