by Chen, QiLiang, Panksepp, Jules B., Lahvis, Garet P.
Published in PloS one (11.02.2009)

by Wimpenny, Joanna H., Weir, Alex A. S., Clayton, Lisa, Rutz, Christian, Kacelnik, Alex
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by Long, Tristan A. F., Pischedda, Alison, Stewart, Andrew D., Rice, William R.
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Published in PloS one (08.01.2009)

by Macrì, Simone, Pasquali, Paolo, Bonsignore, Luca Tommaso, Pieretti, Stefano, Cirulli, Francesca, Chiarotti, Flavia, Laviola, Giovanni
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by Englert, Amy C., Greene, Michael J.
Published in PloS one (10.11.2009)

by Hoke, Kim L, Hensley, Nicholai, Kanwal, Jessleen K, Wasserman, Sara, Morehouse, Nathan I
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