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Njuki, J. M., M. T. Mapila, S. Zingore, and R. Delve. 2008. The dynamics of social capital in influencing use of soil management options in the Chinyanja Triangle of southern Africa. Ecology and Society 13(2): 9. https://doi.org/10.5751/ES-02539-130209
Njuki et al. (Tue,) studied this question.