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Myers, Hugo A. (author)
journal article 1964
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Vreedenburgh, H. (author)
journal article 1963
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van Aken, J.A. (author), Rosingh, W.H.C.E. (author)
journal article 1948
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Davidson, K.S.M. (author), Connelly, D.S. (author)
journal article 1940
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