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Photo of Pauli, Shalit und Bohr in Zürich.

Photos of W. Pauli and O. Hahn.

Photography of J. R. Rydberg.

Portrait made by Antonius Bernardus Kelder

Quotation of Fludd for the paper on the influence of archetype in Kepler's theory.

Phenomenological Equations for Superconductors.

First on table : Pheczele (left) and Heisenberg (right)

Paper for the Congress for scientific philosophy ("Internationaler Kongress für Philosophie der Wissenschaften", Zurich, August 1954).