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Gandolfo, M. A., Farke, A. A., Hermsen, E. J., Zamaloa, M. C., Nixon, K. C., González, C. C., Wilf, P., Cúneo, N. R. and Johnson, K. R. 2011. Oldest Known Eucalyptus Macrofossils Are from South America. PLOS ONE. Vol. 6(6), p. e21084.