D. V. Bykov, A. A. Slavnov, “Dimension-Two Vacuum Condensates in Gauge-Invariant Theories”, Theor Math Phys, 145, № 2, 2005, 1495
R. N. Baranov, D. V. Bykov, A. A. Slavnov, “The condensate ⟨(A µ 2 )⟩ in commutative and noncommutative theories”, Theor Math Phys, 148, № 3, 2006, 1168
M. A. L. Capri, D. Dudal, J. A. Gracey, V. E. R. Lemes, R. F. Sobreiro, S. P. Sorella, H. Verschelde, “Combined study of the gluon and ghost condensates⟨Aμ2⟩and⟨εabcc¯bcc⟩in EuclideanSU(2)Yang-Mills theory in the Landau gauge”, Phys. Rev. D, 73, № 1, 2006, 014001