@book {70,
	title = {Water plants of the world. A manual for the identification of the genera of freshwater macrophytes.},
	year = {1974},
	publisher = {Dr. W. Junk b.v.},
	organization = {Dr. W. Junk b.v.},
	address = {The Hague},
	author = {Cook, Christopher D.K. and Gut, Bernardo J. and Rix, E. Martyn and Schneller, Jakob and Seitz, Marta}
}
