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journal article 1956
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Ligtenberg, F.K. (author) journal article 1956
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journal article 1956
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Schepers, J.A. (author) journal article 1956
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Gerritsma, J. (author) journal article 1956
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journal article 1956
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journal article 1956
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Schuster, Siegfried (author) journal article 1956
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journal article 1956
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journal article 1956
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journal article 1956
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journal article 1956
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Taggart, Robert (author) journal article 1956
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journal article 1956
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Iwai, Akira (author) journal article 1956
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Christensen, H. (author) journal article 1956
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journal article 1956
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van Manen, Jan Dirk (author) journal article 1956
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journal article 1956
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journal article 1956