@article {996,
	title = {Macro-floral assemblages in upland Welsh streams in relation to acidity and their importance to invertebrates.},
	journal = {Freshwater Biology},
	volume = {18},
	year = {1987},
	pages = {545-557},
	author = {Ormerod, S.J. and Wade, K.R. and Gee, A.S.}
}
