Julius
Mac Leod

Ghent University (Chemistry Tree)


Leonard Salomon
Ornstein

Utrecht (Physics Tree)


Paul
Ehrenfest

Leiden (Physics Tree)


Marcel G.J.
Minnaert

Utrecht (Physics Tree)




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Henk
Hoekstra

Leiden
(Options)


Andrej
Dvornik

Ruhr University Bochum

Henk HoekstraX