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Ernst, K., Puppe, B., Schon, P. C., & Manteuffel, G. (2005). A complex automatic feeding system for pigs aimed to induce successful behavioural coping by cognitive adaptation. Appl. Anim. Behav. Sci., 91(3-4), 205–218.
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Spinka, M., Duncan, I. J. H., & Widowski, T. M. (1998). Do domestic pigs prefer short-term to medium-term confinement? Appl. Anim. Behav. Sci., 58(3-4), 221–232.
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Knopff, K., & Pavelka, M. (2006). Feeding Competition and Group Size in Alouatta pigra. Int. J. Primatol., 27(4), 1059–1078.
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Koba, Y., & Tanida, H. (2001). How do miniature pigs discriminate between people?: Discrimination between people wearing coveralls of the same colour. Appl. Anim. Behav. Sci., 73(1), 45–58.
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Koba, Y., & Tanida, H. (1999). How do miniature pigs discriminate between people? The effect of exchanging cues between a non-handler and their familiar handler on discrimination. Appl. Anim. Behav. Sci., 61(3), 239–252.
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Puppe, B., Langbein, J., Bauer, J., & Hoy, S. (2008). A comparative view on social hierarchy formation at different stages of pig production using sociometric measures. Livestock Science, 113(2-3), 155–162.
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Langbein, J., & Puppe, B. (2004). Analysing dominance relationships by sociometric methods--a plea for a more standardised and precise approach in farm animals. Appl. Anim. Behav. Sci., 87(3-4), 293–315.
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Vieuille, C., Berger, F., Le Pape, G., & Bellanger, D. (2003). Sow behaviour involved in the crushing of piglets in outdoor farrowing huts--a brief report. Appl. Anim. Behav. Sci., 80(2), 109–115.
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Gifford, A. K., Cloutier, S., & Newberry, R. C. (2007). Objects as enrichment: Effects of object exposure time and delay interval on object recognition memory of the domestic pig. Appl. Anim. Behav. Sci., 107(3-4), 206–217.
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Lejeune, H., Macar, F., & Zakay, D. (1999). Attention and timing: dual-task performance in pigeons. Behav. Process., 45(1-3), 141–157.
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