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- Lammeren, W.P.A (author) journal article 1963
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- Harvald, Svend Aage (author) journal article 1963
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- De Sitter, W.R. (author) journal article 1963
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- McLeod, William Curtis (author) journal article 1963
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- Stache, F. (author) journal article 1963
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- Upahl, E. (author) journal article 1962