@article{williams_nelson_hesterberg_2000, title={Phosphate and potassium retention and release during chrysanthemum production from precharged materials: I. Alumina}, volume={125}, number={6}, journal={Journal of the American Society for Horticultural Science}, author={Williams, K. A. and Nelson, P. V. and Hesterberg, D.}, year={2000}, pages={748–756} }
 @article{williams_nelson_2000, title={Phosphate and potassium retention and release during chrysanthemum production from precharged materials: II. Calcined clays and brick chips}, volume={125}, number={6}, journal={Journal of the American Society for Horticultural Science}, author={Williams, K. A. and Nelson, P. V.}, year={2000}, pages={757–764} }
 @article{williams_nelson_1997, title={Using precharged zeolite as a source of potassium and phosphate in a soilless container medium during potted chrysanthemum production}, volume={122}, number={5}, journal={Journal of the American Society for Horticultural Science}, author={Williams, K. A. and Nelson, P. V.}, year={1997}, pages={703–708} }