M. W. Greenwood, K.R. Cramer, P.M. Clark, K.C. Behnke and R.S. Beyer
International Journal of Poultry Science 3 ( 3 ): 189 - 194 , 2004
M. W. Greenwood, R.S. Beyer and P.M. Clark
International Journal of Poultry Science 3 ( 7 ): 446 - 449 , 2004