1. Marciano, W., Pagels, H.: Phys. Rep. C 36, 137 (1978)
2. Peskin, M.E., Schroeder, D.V.: An Introduction to Quantum Field Theory. AW, Advanced Book Program (1995)
3. Jaffe, A., Witten, E.: Yang-Mills Existence and Mass Gap. http://www.claymath.org/prize-problems/ , http://www.arthurjaffe.com
4. Gogokhia, V.: Int. J. Theor. Phys. (2009). doi: 10.1007/s10773-009-0101-3 ; arXiv:0806.0247 [hep-ph] [hep-th]
5. Cornwall, J.M.: Phys. Rev. D 26, 1453 (1982)