@article {52069,
	title = {Population age structure and its relationship to the maintenance of a semidesert grassland undergoing invasion by mesquite},
	journal = {The Southwest Naturalist},
	volume = {26},
	year = {1981},
	month = {1981},
	pages = {13-22},
	url = {/files/bibliography/209.pdf},
	author = {R. G. Wright and G.M. Van Dyne}
}
