Ginzburg-Landau theory of Fulde-Ferrell-Larkin-Ovchinnikov states in   unconventional singlet superconductors with impurities
  We derive the Ginzburg-Landau theory of unconventional singlet superconductors in the presence of a Zeeman field and impurities, in order to examine the resulting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases. We show that the behavior of the FFLO phases in unconventional superconductors in the presence of impurities is qualitatively different from that found for s-wave superconductors. 
D. F. Agterberg and Kun Yang