1. Einige Folgerungen aus der Schr�dingerschen Theorie f�r die Termstrukturen
2. The latter classic paper on time reversal is reproduced as chapter 26 of E.P. Wigner, Group Theory (Academic Press, 1959).
3. G. Luders, Danske Videns Selskab Mat-Fys Medd. 28, No. 5 (1954);
4. Proof of the TCP theorem