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V. Kapetanakis,
Arvaniti,
H. R,
2014
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M.,
C.,
George,
2022
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M. Beuzekom,
D. Eijk,
V. Heijne,
2011
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Hawthorne,
Abdu,
Cooper,
2012
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Claude,
James,
Daniel,
1981,
American Journal of Sociology.
Claude,
Arnold,
Phillip,
1972,
American Journal of Sociology.