@article {28185,
	title = {Helicopter vs. fixed-wing aircraft for censuring animals in winter},
	volume = {Unpublished report AFW-70-035},
	year = {1970},
	pages = {5},
	institution = {University of Wisconsin, Madison, Dept. of Wildlife Ecology},
	author = {Nellis, C. and Keith, L. B.}
}
