**Chapter 7**

**References**

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[2] Ghosh, S., Shekhter, A., Jerzembeck, F. et al. Thermodynamic evidence for a two–component superconducting order parameter in Sr2RuO4. Nat. Phys. (2020). https://doi.org/10.1038/s41567–

[3] Benhabib, S., Lupien, C., Paul, I. et al. Ultrasound evidence for a two– component superconducting order parameter in Sr2RuO4. Nat. Phys. (2020). https://doi.org/10.1038/s41567–

[4] Agterberg, D.F. The symmetry of superconducting Sr2RuO4. Nat. Phys. (2020). https://doi.org/10.1038/s41567–

[5] Peter Brusov and Tatiana Filatova (August 24th 2015). How to Distinguish the Mixture of Two D–wave States from

Superconductors – New Developments, Alexander Gabovich, IntechOpen, DOI: 10.5772/59180. Available from: https://

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[7] Brusov P.N., V.N.Popov (1981), Superfluidity and Bose–excitations in He3 films Sov. Phys. JETP, 53(4),

[8] Brusov P.N., V.N.Popov (1982), Superfluidity and Bose–excitations in He3 films Phys.Lett., **87A**, #9, 472.

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Collective Excitations in
