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2. Some notes on Myriophyllum spicatum;Löve;Rhodora,1961
3. Identification and management of Eurasian water-milfoil in Wisconsin;Nichols;Wis. Acad. Sci. Arts Lett.,1975
4. Selected Weeds of the United States;Reed;Agricultural Research Service, United States Department of Agriculture Handbook,1970
5. The Biology of Aquatic Vascular Plants;Sculthorpe,1967