M. Mc Innis, Vavra, M., and Krueger, W. Clement,
“A Comparison of Four Methods Used to Determine the Diets of Large Herbivores”,
Journal of Range Management, vol. 36, no. 3, p. 302, 1983.
M. Vavra, Rice, R. W., and Hansen, R. M.,
“A Comparison of Esophageal Fistula and Fecal Material to Determine Steer Diets”,
Journal of Range Management, vol. 31, no. 1, p. 11, 1978.
J. L. Holechek, Vavra, M., Skovlin, J., and Krueger, W. Clement,
“Cattle Diets in the Blue Mountains of Oregon, I. Grasslands”,
Journal of Range Management, vol. 35, no. 1, p. 109, 1982.