Brown, Michael J., and Whittingham, Ian B. (2017) Soft symmetry improvement of two particle irreducible effective actions. Physical Review D, 95 (2). 025018. pp. 1-18.

Brown, Michael Jonathan (2017) Symmetry improvement techniques for non-perturbative quantum field theory. PhD thesis, James Cook University.

Brown, Michael, Whittingham, Ian B., and Kosov, Daniel S. (2016) Linear response theory for symmetry improved two particle irreducible effective actions. Physical Review D, 93 (10). 105018 . pp. 1-13.

Brown, Michael, and Whittingham, Ian (2015) Two-particle irreducible effective actions versus resummation: analytic properties and self-consistency. Nuclear Physics B, 900. pp. 477-500.

Brown, Michael J., and Whittingham, Ian B. (2015) Symmetry improvement of 3PI effective actions for O(N) scalar field theory. Physical Review D (Particles, Fields, Gravitation and Cosmology), 91 (8). 085020. pp. 1-27.