@article{GDZPPN002487381,
title = {Drichlet Convolution of Contangent Numbers and Relative Class Number Formulas.},
journal = {Monatshefte f\"ur Mathematik},
volume = {109},
year = {1990},
pages = {231-256},
zbl = {0717.11048},
url = {http://dml.mathdoc.fr/item/GDZPPN002487381}
}
Girstmair, Kurt. Drichlet Convolution of Contangent Numbers and Relative Class Number Formulas.. Monatshefte für Mathematik, Tome 109 (1990) pp. 231-256. http://gdmltest.u-ga.fr/item/GDZPPN002487381/