@article {40830,
	title = {Biased detection of bird vocalizations affects comparisons of bird abundance among forested habitats},
	volume = {99},
	year = {1997},
	pages = {179-190},
	publisher = {The Condor},
	url = {http://www.jstor.org/stable/1370236},
	author = {Schieck, Jim}
}
