Freire, F. and Litim, D. F. (1999) Charge cross-over at the U(1)-Higgs phase transition. (Preprint)
Freire, F. and Litim, D. F. and Pawlowski, J. M. (2001) Gauge invariance, background fields and modified Ward identities. (Preprint)
Litim, D. F. and Pawlowski, J. M. (1999) On Gauge Invariant Wilsonian Flows.