no. 3
Connections between B 2,χ for even quadratic Dirichlet characters χ and class numbers of appropriate imaginary quadratic fields, I
Compositio Mathematica, Tome 75 (1990) no. 3, pp. 247-270.
corrigé par Errata to the papers : “Connections between B 2,χ for even quadratic Dirichlet characters χ” and “Class numbers of appropriate imaginary quadratic fields, parts I and II”
partie suivante Connections between B 2,χ for even quadratic Dirichlet characters χ and class numbers of appropriate imaginary quadratic fields, II 
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     author = {Urbanowicz, Jerzy},
     title = {Connections between $B_{2,\chi }$ for even quadratic {Dirichlet} characters $\chi $ and class numbers of appropriate imaginary quadratic fields, {I}},
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     publisher = {Kluwer Academic Publishers},
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     number = {3},
     year = {1990},
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}
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Urbanowicz, Jerzy. Connections between $B_{2,\chi }$ for even quadratic Dirichlet characters $\chi $ and class numbers of appropriate imaginary quadratic fields, I. Compositio Mathematica, Tome 75 (1990) no. 3, pp. 247-270. http://archive.numdam.org/item/CM_1990__75_3_247_0/

[1] G. Gras: Pseudo-mesures p-adiques associees aux fonctions L de Q, Manuscripta Math. 57 (1987), 373-415. | MR | Zbl

[2] K. Kramer and A. Candiotti: On the 2-Sylow subgroup of the Hilbert kernel of K2 of number fields, Acta Arithm. 52 (1989), 49-65. | MR | Zbl

[3] M. Lerch: Essai sur le calcul du nombre des classes de formes quadratiques binaires aux coefficients entiers, Acta Math. 29 (1905), 333-424. | JFM

[4] B. Mazur and A. Wiles: Class fields of abelian extensions of Q, Invent. Math. 76 (1984), 179-330. | MR | Zbl

[5] J. Urbanowicz: On the 2-primary part of a conjecture of Birch-Tate, Acta Arithm. 43 (1983), 69-81. | MR | Zbl

[6] L.C. Washington: Introduction to cyclotomic fields, Springer Verlag, New York-Heidelberg -Berlin 1982. | MR | Zbl