@article {51610,
	title = {Evaluation of a continuous-release <i>ytterbium bolus</i>},
	journal = {Journal of Range Management},
	volume = {43},
	number = {2},
	year = {1990},
	month = {1990},
	pages = {144-147},
	keywords = {beef steers, continuous marker, fecal output, ytterbium},
	url = {/files/bibliography/90-001.pdf},
	author = {Richard E. Estell and Freeman, A.S. and Galyean, M.L. and Wallace, J.D.}
}
