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Havelock, Th.H. (author) journal article 1909
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Gerritsma, J. (author) conference paper 1954
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Gerritsma, J. (author) journal article 1961
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Gerritsma, J. (author), Beukelman, W. (author) journal article 1963
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Gerritsma, J. (author) journal article 1963
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Gerritsma, J. (author), Beukelman, W. (author) journal article 1963
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Davis, M.C. (author) conference paper 1964
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book 1964
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Johnsson, C.A. (author) conference paper 1966
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Suarez, A. (author) conference paper 1969
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Cleary, W.A. (author) other
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Glansdorp, C.C. (author) journal article 1972
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Glansdorp, C.C. (author) book 1982
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Keuning, Lex J.A. (author) journal article 1984
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Keuning, Lex J.A. (author) journal article 1985
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Capin, John R. (author) other 1987