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Environmental Earth Sciences > 2014 > 71 > 3 > 1213-1225
Journal of African Earth Sciences > 2004 > 39 > 3-5 > 541-548
Environmental Earth Sciences > 2014 > 71 > 3 > 1213-1225
Journal of African Earth Sciences > 2004 > 39 > 3-5 > 541-548