@book {8566,
	title = {Docks and knotweeds of the British Isles (BSBI Handbook n{\textdegree} 3)},
	year = {1981},
	month = {1981///},
	publisher = {BSBI, London},
	organization = {BSBI, London},
	author = {J.E. Lousley and D.H. Kent}
}
@book {8542,
	title = {Grass weeds II},
	year = {1981},
	month = {1981///},
	publisher = {Documenta, Ciba-Geigy, Basle: XX},
	organization = {Documenta, Ciba-Geigy, Basle: XX},
	author = {H. Scholz}
}
