(Anti-)self-dual homogeneous vacuum gluon field as an origin of confinement and SUL(NF) × SUR(NF) symmetry breaking in QCDG. V. Efimov and S. N. NedelkoEur. Phys. J. C, 1 1-2 (1998) 343-350DOI: https://doi.org/epjc/v1/p343(epj649)