@article {38780,
	title = {Ecophysiology of shade needles of Picea glauca saplings in relation to removal of competing hardwoods and degree of prior shading},
	volume = {12},
	year = {1993},
	pages = {271-280},
	publisher = {Tree Physiology},
	author = {Lieffers, V. J. and Mugasha, A. G. and Macdonald, S. E.}
}
