Weed Risk Assessment for Limnobium laevigatum (Humb. & Bonpl. ex Willd.) Heine (Hydrocharitaceae) – South American spongeplant. USDA-APHIS 2013.
Weed Risk Assessment for Limnobium laevigatum (Humb. & Bonpl. ex Willd.) Heine (Hydrocharitaceae) – South American spongeplant [pdf]Paper  Weed Risk Assessment for Limnobium laevigatum (Humb. & Bonpl. ex Willd.) Heine (Hydrocharitaceae) – South American spongeplant [pdf]Website  bibtex   

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