Fermi Liquid instabilities in two-dimensional lattice models
  We develop a procedure for detecting Fermi liquid instabilities by extending the analysis of Pomeranchuk to two-dimensional lattice systems. The method is very general and straightforward to apply, thus providing a powerful tool for the search of exotic phases. We test it by applying it to a lattice electron model with interactions leading to $s$ and d-wave instabilities. 
C.A. Lamas, D.C. Cabra and N. Grandi