Construction of some classes in the cohomology of Siegel modular threefolds
Compositio Mathematica, Tome 97 (1995) no. 1-2, pp. 173-186. 
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     author = {Nygaard, Niels O.},
     title = {Construction of some classes in the cohomology of {Siegel} modular threefolds},
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     publisher = {Kluwer Academic Publishers},
     volume = {97},
     number = {1-2},
     year = {1995},
     mrnumber = {1355124},
     zbl = {0838.11046},
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     url = {http://www.numdam.org/item/CM_1995__97_1-2_173_0/}
}
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Nygaard, Niels O. Construction of some classes in the cohomology of Siegel modular threefolds. Compositio Mathematica, Tome 97 (1995) no. 1-2, pp. 173-186. http://www.numdam.org/item/CM_1995__97_1-2_173_0/

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