1. Bach, V., Fröhlich, J., Jonsson, L.: Bogolubov-Hartree-Fock mean field theory for neutron stars and other systems with attractive interactions. J. Math. Phys 102102, 50 (2009)
2. Bach, V., Lieb, E.H., Solovej, J.P., Generalized Hartree-Fock theory and the Hubbard model. J. Stat Phys 76, 3–89 (1994)
3. Bräunlich, G., Hainzl, C., Seiringer, R.: Translation invariant quasi-free states for fermionic systems and the BCS approximation. Rev. Math. Phys 1450012, 26 (2014)
4. Drechsler, M., Zwerger, W.: Crossover from BCS-superconductivity to Bose-condensation. Ann. Phys 504, 15–23 (1992)
5. Frank, R.L., Hainzl, C., Naboko, S., Seiringer, R.: The critical temperature for the BCS equation at weak coupling. J. Geom. Anal 17, 559–567 (2007)