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1by Oehlenschläger, JörgSubjects: “...length variation...”
Published 1992
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2by Lamp, F.Subjects: “...seasonal variation...”
Published 1988
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3by Kosswig, K.Subjects: “...annual variation...”
Published 1981
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4by Reinsch, H.H.Subjects: “...variations...”
Published 1967
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5