@book{247217,
	author = {Ascherson, P. and Graebner, P.},
	title = {Potamogetonaceae},
	publisher = {H. R. Engelmann; J. Cramer},
	year = {1968},
	series = {Das Pflanzenreich Regni Vegetabilis Conspectus},
	address = {Weinhem},
	note = {Abteilung IV.11 mit 221 Einzelbildern in 36 Figuren}
}