@book {8644,
	title = {Alien grasses of the British Isles},
	year = {1996},
	month = {1996///},
	publisher = {BSBI, London: XX},
	organization = {BSBI, London: XX},
	author = {T.B. Ryves and E.J. Clement and M.C. Foster}
}
@book {8517,
	title = {Alien plants of the British Isles},
	year = {1994},
	month = {1994///},
	publisher = {BSBI, London: XVIII},
	organization = {BSBI, London: XVIII},
	author = {E.J. Clement and M.C. Foster}
}
