@article{cheng_landesman_bergmann_classen_howard_yamamoto_2002, title={Nutrient removal from swine lagoon liquid by Lemna minor 8627}, volume={45}, DOI={10.13031/2013.9953}, number={4}, journal={Transactions of the ASAE}, author={Cheng, J. and Landesman, L. and Bergmann, Ben and Classen, J. J. and Howard, J. W. and Yamamoto, Y. T.}, year={2002}, pages={1003–1010} }
 @inproceedings{cheng_bergmann_classen_stomp_howard_2000, title={Nutrient removal from swine wastewater by duckweed - Spirodela punctata}, volume={1}, ISBN={1900222681}, booktitle={Industrial wastewater and envrironmental contaminants : proceedings of the 1st World Water Congress of the International Water Association, held in Paris, France, 3-7 July 2000}, author={Cheng, J. and Bergmann, B. A. and Classen, J. J. and Stomp, A. M. and Howard, J. W.}, year={2000} }