@article {37948,
	title = {Head tube: a simple device for estimating velocity in running water},
	volume = {222},
	year = {1991},
	pages = {109-114},
	publisher = {Hydrobiologia},
	url = {http://www.springerlink.com/content/q3g73k30vt712122/},
	author = {Ciborowski, J. J. H.}
}
