Seasonal exposures to triazine and other pesticides in surface waters in the western Highveld corn-production region in South Africa - Du Preez, L.H.; Jansen Van Rensburg, P.J.; Jooste, A.M.; Carr, J.A.; Giesy, J. P.; Gross, T. S.; Kendall, R.J.; Smith, E.E.; Van Der Kraak, G.; Solomon, K.R. (Environmental Pollution, 2005)