Noyes, J. H., R. G. Sasser, B. K. Johnson, L. D. Bryant, and B. Alexander. 1997. Accuracy of pregnancy detection by serum protein (PSPB) in elk. Wildlife Society Bulletin 25:695-698.
Huang, F.; Cockrell, D.C.; Stephenson, T.R.; Noyes, J.H.; Sasser, R.G. 2000. A specific radioimmunoassay for moose and elk pregnancy-specific protein B in serum. Journal of Wildlife Management 64:492-499.
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"Long-term
studies of elk, deer, and cattle in managed forests."