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Rockenbach, Bettina 
ORCID: 0000-0003-2624-1964 and Milinski, Manfred
(2011).
To qualify as a social partner, humans hide severe punishment, although their observed cooperativeness is decisive.
Proc. Natl. Acad. Sci. U. S. A., 108 (45).
S. 18307 - 18313.
WASHINGTON:
NATL ACAD SCIENCES.
ISSN 0027-8424