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In page Carolyne Van Vliet:

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Van Vliet obtained a BS in physics and mathematics from Vrije Universiteit, Amsterdam in 1949. Van Vliet then obtained an MA in physics from the same university in 1953, and a PhD in 1956 for a thesis titled Current Fluctuations in Semiconductors and Photoconductors, under Gerardus J. Sizoo.[citation needed]