Parents

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Jacobus Cornelis Kapteyn research assistant 1913-1915 RUG (Physics Tree)
Andreas Smits grad student 1915 Amsterdam (Chemistry Tree)
 (Opalescence critique, théorie et expériments)

Children

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Christoffel J. Bouwkamp grad student 1941 RUG
Bernard R.A. Nijboer grad student 1942 RUG (Physics Tree)
Michael Waterworth research scientist physics (Physics Tree)