Hansen, D., Duda, P.J., Zayed, A. and Terry, N.  1998.  Selenium removal by constructed wetlands: Role of
          Biological Volatilization.  Environ. Sci. Technol 32:591-597.

          Zayed, A., Gowthaman, S. and Terry, N.  1998.  Phytoaccumulation of toxic trace elements by wetland plants:
          I. Duckweed (Lemna minor L.).  J. Environ. Quality 27: 715-721.

          Lytle, C.M., Lytle, F.W., Yang, N., Qian, J.-H., Hansen, D., Zayed, A. and Terry, N. 1998.
          Phyto-conversion of hexavalent chromium (Cr6+) to trivalent chromium (Cr3+) by wetland plants.  Environ.
          Sci. Technol., 32:3087-3093.

          Pilon-Smits, E.A.H., de Souza, M.P., Lytle, C.M., Shang, C., Lugo, T. and Terry, N.  1998.  Selenium
          volatilization and assimilation by hybrid poplar (Populus tremula x alba).  J. Exp. Botany,
          49(328):1889-1892.

          Zhu, Y.L., Zayed, A., Qian, J.-H., de Souza, M. and Terry, N.  1999. Phytoremediation of toxic trace
          elements by wetland plants: II. Water Hyacinth (Eichhornia crassipes).  J. Environ. Quality, 28:339-344.

          Pilon-Smits, E.A.H., de Souza, M.P., Hong, G., Amini, A., Bravo, R.C., Payabyab, S. and Terry, N.  1999.
          Selenium volatilization and accumulation by twenty aquatic plant species.  Journal of Environmental Quality,
          28(3):1011-1018.

          Qian, J.-H., Zayed, A., Zhu, Y.L., Yu, M. and Terry, N.  1999. Phytoremediation of toxic trace elements by wetland
          plants: II. Uptake and accumulation of ten trace elements by twelve plant species  J. Environ. Quality,
          28(5):September/October
          Issue (In press).