Phase Transition in Asymmetrical Superfluids I: Equal Fermi Surfaces
  In this paper, we study phase transitions in asymmetrical fermion superfluids. In this scenario, the candidates to form pair are particles with mismatched masses and chemical potentials. We derive an expression for the critical temperature in terms of the gap and masses (or chemical potentials) when the constraint of equal Fermi surfaces $m_a\mu_a = m_b\mu_b$ is imposed. 
Heron Caldas, C.W. Morais and A.L. Mota