1. Streater, R. F., andA. S. Wightman: PCT, spin statistics, and all that. p. 134. New York-Amsterdam: W. A. Benjamin, Inc. 1964.
2. Jost, R.: Eine Bemerkung zum CTP Theorem. Helv. Phys. Acta30, 409 (1957).
3. Källën, G., andA. S. Wightman: Dan. Vid. Selsk. Mat. Fys. Skr. 1, n° 6 (1958).
4. Boas, R. P.: Entire functions, chap. 5, see. I, theorem 12. New York: Academic Press Inc. 1954.