@article {31318,
	title = {Collecting semi-quantitative samples of black fly larvae (Diptera : Simuliidae) and other aquatic insects from large rivers with aid of artificial substrates},
	volume = {14},
	year = {1978},
	pages = {411-432},
	publisher = {Quaestiones Entomologicae},
	author = {Fredeen, F. J. H. and Spurr, D. T.}
}
