@article {6291,
	title = {The Reliability of Tree Crown Position},
	journal = {Canadian Journal of Forest Research},
	volume = {21},
	year = {1991},
	pages = {689-701},
	keywords = {Forest canopy, Spruce-Fir forests, Trees},
	author = {Nicholas, Niki Stephanie and Gregoire, T. G and Zedaker, Shephard M}
}
