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- Struyk, A.P. (author) doctoral thesis 1928
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- Den Dooren de Jong, L.E. (author) doctoral thesis 1926
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- Donker, H.J.L. (author) doctoral thesis 1926
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- Visser 't Hooft, F. (author) doctoral thesis 1925
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- Von Wolzogen Kühr, C.A.H. (author) doctoral thesis 1923
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