We discuss properties of the Fermi system which contain one or more spherical (or almost spherical) objects. The interplay between various effects, such as shell correction and chaotic behavior is considered. We briefly mention the role of the temperature, pairing, and effects associated with bubble dynamics.
PACS numbers: 21.10.Dr, 21.65.+f, 97.60.Jd, 67.55.Lf
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