1. Hong, X.Q., Hirsch, J.E.: Hole superconductivity in a generalized two-band model. Phys. Rev. B 45, 12556–12560 (1992)
2. Kruchinin, S., Nagao, H., Aono, S.: Modern aspects of superconductivity. World Sci. 230 (2010)
3. Kondo, J.: Theory of multiband superconductivity. J. Phys. Soc. Jpn. 71, 1353–1359 (2002)
4. Zehetmayer, A.: A review of two-band superconductivity, pp. 1–40. arXiv: 1402.3956 (2014)
5. Innocenti, D., Boccia, N., Ricci, A., Valletta, A., Caprara, S., Perali, A., Bianconi, A.: Resonant and crossover phenomena in multiband superconductors. Phys. Rev. B 82(184528), 1–12 (2010)