1. R. L. Jaffe, Phys. Rev. D: Part. Fields 15, 267 (1977).
2. T. Yamazaki and Y. Akaishi, Phys. Lett. B 535, 70 (2002).
3. P. Z. Aslanyan et al., in Proc. Int. Conf. on LEAP05, May 16–22, Bonn-Julich, Germany, 2005, Vol. 796 (AIP, Melville, NY, 2005), p. 195.
4. P. Z. Aslanyan, JINR Commun. E-2001-265 (2002);
5. P. Z. Aslanyan, Nucl. Phys. B 75, 63-65 (1999).