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@article{JRAM_1992__430_153449, author = {R. Weissauer}, title = {The {Picard} group of {Siegel} modular threefolds.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {179--211}, publisher = {mathdoc}, volume = {430}, year = {1992}, zbl = {0749.14017}, url = {http://geodesic.mathdoc.fr/item/JRAM_1992__430_153449/} }
R. Weissauer. The Picard group of Siegel modular threefolds.. Journal für die reine und angewandte Mathematik, Tome 430 (1992), pp. 179-211. http://geodesic.mathdoc.fr/item/JRAM_1992__430_153449/