Geodesic
On some questions in the theory of $\Gamma$-extensions of algebraic number fields.~II
Izvestiya. Mathematics , Tome 10 (1976) no. 4, pp. 675-685.

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The space of all $\Gamma$-extensions of a given algebraic number field is considered. The behavior of certain invariants of $\Gamma$-extensions as functions on this space is studied by methods of commutative algebra. Bibliography: 4 titles. 
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V. A. Babaitsev. On some questions in the theory of $\Gamma$-extensions of algebraic number fields.~II. Izvestiya. Mathematics , Tome 10 (1976) no. 4, pp. 675-685. http://geodesic.mathdoc.fr/item/IM2_1976_10_4_a0/

[1] Burbaki N., Kommutativnaya algebra, Mir, M., 1971 | MR

[2] Kuzmin L. V., “Modul Teita polei algebraicheskikh chisel”, Izv. AN SSSR. Ser. matem., 36 (1972), 167–327

[3] Babaitsev V. A., “O nekotorykh voprosakh teorii $\Gamma$-rasshirenii polei algebraicheskikh chisel”, Izv. AN SSSR. Ser. matem., 40 (1976), 477–487

[4] Greenberg R., “The Iwasawa invariants of $\Gamma$-extensions of a fixed number field”, Amer. J. Math., XCV:1 (1973), 204–214 | DOI | MR