Calculations related with a letter from Weisskopf to Pauli (5/457).

Calculations on "Schwinger, quantization in Dirac's theory".

Calculations, probably on an article by T. Kinoschita and [?].

Calculations, probably on D-function.

Calculations on vacuum polarization.

Calculations on Møller-Kristensen's theory as example for Peierls' formalism.

Calculations.

Calculations.

Calculations.