Herbert, D. A., Jr., Stromberg, E. L., Chappell, G. F., Malone, S. M., (1999). Journal of Production Agriculture 12(1), 105-109. English language
Graeber, J. V., Nafziger, E. D., Mies, D. W., (1999). Journal of Production Agriculture 12(4), 659-663. English language
Nelson, K. A., Renner, K. A., (1999). Journal of Production Agriculture 12(3), 460-465. English language
Lee, C. J., Manthey, F. A., Ellefson, R. S., Horsley, R. D., Schwarz, P. B., (1997). Journal of Production Agriculture 10(2), 320-322. English language
Mathre, D. E., Kushnak, G. D., Martin, J. M., Grey, W. E., Johnston, R. H., (1997). Journal of Production Agriculture 10(2), 323-326. English language
Kennedy, A. C., Kremer, R. J., (1996). Journal of Production Agriculture 9(4), 480-485. English language
Jewett, J. G., Sheaffer, C. C., Moon, R. D., Martin, N. P., Barnes, D. K., Breitbach, D. D., Jordan, N. R., (1996). Journal of Production Agriculture 9(4), 535-542. English language
Lyon, D. J., Baltensperger, D. D., Rush, I. G., (1992). Journal of Production Agriculture 5(2), 282-285. English language
Wiersma, D. W., Grau, C. R., Undersander, D. J., (1995). Journal of Production Agriculture 8(2), 259-264. English language
Howard, D. D., Chambers, A. Y., Logan, J., (1994). Journal of Production Agriculture 7(4), 448-454. English language