1. Gudkov, V.P.: Phys. Rept. 212, 77 (1992)
2. Stodolsky, L.: Nucl. Phys. B197, 213 (1982)
3. Kabir, P.K.: Phys. Rev. D25, 2013 (1982)
4. Ryndin, R.M.: Private communication. (1981) For a partial proof of the theorem see proceeding of 3rd LNPI Winter School (Ryndin, R.M. Test of T-invariance in strong interactions)
5. Bilenkii, S.M., Lapidus, L.I., Ryndin, R.M.: Phys. Uspekhi 7, 721 (1965)