A. Salam apologizes for a mistake he made in a letter to Pauli.

Touschek answers a letter from Pauli, who had made some comments on a calculation.

G. Källén makes some comments about remarks on calculations he made.

Notes, graphics and calculations on Lee model.

Lorentz transformations, time inversion.

Extract of a letter by W. Pauli to J. Schwinger from 24.01.1949.

Related to a letter of W. Pauli on vacuum polarization in the theory of spin 0 particles.

Circular about the discussion for the 3rd Zurich talks (18 to 21 April 1951).

Letter from the direction of the International Congress in science philosophy (Zurich, August 1954).