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Aachen: RWTH, 1971
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Berlin; Heidelberg [u.a.]: Springer, 1985
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Bonn, Germany: IZA - Institute of Labor Economics, May 2023
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Wiley, 1971
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Wiley, 1971
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Wiley, 1981
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Walter de Gruyter GmbH, 1966
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Springer Science and Business Media LLC, 1966
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Wiley, 1996
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Wiley, 1996
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Wiley, 1996
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Wiley, 1988
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Wiley, 1960
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Wiley, 1990
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Wiley, 1989
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Wiley, 1984
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Springer Science and Business Media LLC, 1980
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Wiley, 1970
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Wiley, 2022