Tu D T M, Dong N T K and Preston T R 2012:
Effect on composition of duckweed (Lemna minor) of different levels of biodigester effluent in the growth medium and of transferring nutrient-rich duckweed to nutrient-free water.
Livestock Research for Rural Development. Volume 24, Article #71.
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, from http://www.lrrd.org/lrrd24/4/mytu24071.htm