by Hatch, L.U, Zidack, W.E, Barnes, T.A, Thorpe, T.K
Published in Highlights of agricultural research (1989)

by Irby L.R, Saltiel J, Zidack W.E, Johnson J.B
Published in Wildlife Society bulletin (01.07.1997)

by Irby, L.R. (Montana State University, Bozeman, MT.), Zidack, W.E, Johnson, J.B, Saltiel, J
Published in Journal of range management (01.07.1996)