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}},
     journal = {Compositio Mathematica},
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     year = {1990},
     publisher = {Kluwer Academic Publishers},
     volume = {75},
     number = {3},
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     url = {https://www.numdam.org/item/CM_1990__75_3_247_0/}
}
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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. https://www.numdam.org/item/CM_1990__75_3_247_0/

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