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Signoret, J. P., Fulkerson, W. J., & Lindsay, D. R. (1982). Effectiveness of testosterone-treated wethers and ewes as teasers. Applied Animal Ethology, 9(1), 37–45. doi:10.1016/0304-3762(82)90164-x 
10.1016/0304-3762(82)90164-x