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Laister, S., Stockinger, B., Regner, A. - M., Zenger, K., Knierim, U., & Winckler, C. (2011). Social licking in dairy cattle--Effects on heart rate in performers and receivers. Appl. Anim. Behav. Sci., 130(3-4), 81–90.
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Menke, C., Waiblinger, S., Foelsch, D. W., & Wiepkema, P. R. (1999). Social Behaviour and Injuries of Horned Cows in Loose Housing Systems. Anim Welfare, 8(3), 243–258.
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Menke, C., Waiblinger, S., Fölsch, D. W., & Wiepkema, P. R. (2008). Social Behaviour and Injuries of Horned Cows in Loose Housing Systems. Anim Welfare, 8(3), 243–258.
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Rybarczyk, P., Koba, Y., Rushen, J., Tanida, H., & de Passille, A. M. (2001). Can cows discriminate people by their faces? Appl. Anim. Behav. Sci., 74(3), 175–189.
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