%0 Journal Article %A Urbanowicz, Jerzy %T Connections between $B_{2,\chi }$ for even quadratic Dirichlet characters $\chi $ and class numbers of appropriate imaginary quadratic fields, I %J Compositio Mathematica %D 1990 %P 247-270 %V 75 %N 3 %I Kluwer Academic Publishers %U http://archive.numdam.org/item/CM_1990__75_3_247_0/ %G en %F CM_1990__75_3_247_0