Renormalization of self-consistent Schwinger-Dyson equations at finite   temperature
  We show that Dyson resummation schemes based on Baym's $\Phi$-derivable approximations can be renormalized with counter term structures solely defined on the vacuum level. First applications to the self-consistent solution of the sunset self-energy in $\phi^4$-theory are presented. 
H. van Hees, J. Knoll