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I thank M. Cramer for useful discussions.
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Midgley, J.J. More mysterious mounds: origins of the Brazilian campos de murundus . Plant Soil 336, 1–2 (2010). https://doi.org/10.1007/s11104-010-0355-9
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DOI: https://doi.org/10.1007/s11104-010-0355-9