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@article{JRAM_1989__402_153187, author = {J. Brzezinski}, title = {A combinatorial class number formula.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {199--210}, publisher = {mathdoc}, volume = {402}, year = {1989}, zbl = {0674.16003}, url = {http://geodesic.mathdoc.fr/item/JRAM_1989__402_153187/} }
J. Brzezinski. A combinatorial class number formula.. Journal für die reine und angewandte Mathematik, Tome 402 (1989), pp. 199-210. http://geodesic.mathdoc.fr/item/JRAM_1989__402_153187/