[1] M. A., Shifman, Phys. Rept. 209, 341 (1991) [see also M. Shifman (ed.), Vacuum Structure and QCD Sum Rules (North-Holland, Amsterdam, 1992)].

[2] A., Casher, J. B., Kogut, and L., Susskind, Phys. Rev. Lett. 31, 792 (1973). J. B. Kogut and L. Susskind, Phys. Rev. D11, 3594 (1975).

[3] J. E., Hetrick and Y., Hosotani, Phys. Rev. D 38, 2621 (1988).

[4] V. N., Gribov, Gauge Theories and Quark Confinement (Phasis, Moscow, 2002), p. 271.Google Scholar

[5] M. A., Shifman and A. V., Smilga, Phys. Rev. D 50, 7659 (1994) [arXiv:hep-th/9407007].

[6] N., Seiberg, JHEP 1007, 070 (2010) [arXiv:1005.0002 [hep-th]].

[7] V. A., Novikov, M. A., Shifman, A. I., Vainshtein, and V. I., Zakharov, Fortsch. Phys. 32, 585 (1984) [see also M. Shifman (ed.), Vacuum Structure and QCD Sum Rules (North-Holland, Amsterdam, 1992)].

[8] S. L., Adler, Phys. Rev. 177, 2426 (1969); J. S. Bell and R. Jackiw, Nuovo Cim. A60, 47 (1969).

[9] A. D., Dolgov and V. I., Zakharov, Nucl. Phys. B 27, 525 (1971).

[10] G., 't Hooft, Naturalness, chiral symmetry, and spontaneous chiral symmetry breaking, in G., 't Hooft, C., Itzykson, A., Jaffe, et al. (eds.), Recent Developments In Gauge Theories (Plenum Press, New York, 1980) [reprinted in E. Farhi et al. (eds.), Dynamical Symmetry Breaking (World Scientific, Singapore, 1982), p. 345, and in G. 't Hooft, Under the Spell of the Gauge Principle (World Scientific, Singapore, 1994), p. 352].Google Scholar

[11] S. R., Coleman and E., Witten, Phys. Rev. Lett. 45, 100 (1980).

[12] D., Amati and E., Rabinovici, Phys. Lett. B 101, 407 (1981).

[13] S. B., Treiman, E., Witten, R., Jackiw, and B., Zumino, Current Algebra and Anomalies (World Scientific, Singapore, 1985).Google Scholar

[14] J. C., Collins, A., Duncan, and S. D., Joglekar, Phys. Rev. D 16, 438 (1977).

[15] M. A., Shifman, A. I., Vainshtein, and V. I., Zakharov, Phys. Lett. B 78, 443 (1978).