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Number of items: 1.
Beierlein, Constanz, Davidov, Eldad 
ORCID: 0000-0002-3396-969X, Schmidt, Peter and Schwartz, Shalom H.
(2012).
Testing the discriminant validity of Schwartz' Portrait Value Questionnaire items – A replication and extension of Knoppen and Saris (2009).
Survey Research Methods, 6(1),25-36, 6 (1).
pp. 25-36.
Konstanz:
European Survey Research Association.
ISSN 1864-3361