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Geneva: International Labour Office, 1966
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Hamburg: Verlag Weltarchiv; Heidelberg: Springer, 1968
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Oxford University Press (OUP), 1969
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JSTOR, 1967
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JSTOR, 1967
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American Physical Society (APS), 2003
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Wiley, 2003
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Elsevier BV, 1998
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Portland Press Ltd., 1994
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Elsevier BV, 1994
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Elsevier BV, 1993
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Portland Press Ltd., 1992
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Wiley, 2004
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Springer Science and Business Media LLC, 2003
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Ovid Technologies (Wolters Kluwer Health), 1999
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BMJ, 1997
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Elsevier BV, 1989
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Springer Science and Business Media LLC, 1989