Illicit trade
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Tsai, Y.W., Sung, H.Y., Yang, C.L. et al. 2003
Shafey, O., Cokkinides, V., Cavalcante, T.M. et al. 2002
Emery, S., White, M.M., Gilpin, E.A. et al. 2002
Leverett, M., Ashe, M., Gerard, S. et al. 2002