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1Almmustuhtton 1995Fáttát “...Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716....”
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2Dahkki Jolley, NicholasFáttát “...Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716....”
Almmustuhtton 2005
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3Dahkki Jolley, NicholasFáttát “...Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716 Contributions in theory of ideas....”
Almmustuhtton 1990
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