no. 2
Singularities of the moduli spaces of certain abelian surfaces
Compositio Mathematica, Tome 79 (1991) no. 2, pp. 231-253 
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     author = {Hulek, Klaus and Kahn, Constantin and Weintraub, Steven H.},
     title = {Singularities of the moduli spaces of certain abelian surfaces},
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     pages = {231--253},
     year = {1991},
     publisher = {Kluwer Academic Publishers},
     volume = {79},
     number = {2},
     mrnumber = {1117341},
     zbl = {0741.14022},
     language = {en},
     url = {https://www.numdam.org/item/CM_1991__79_2_231_0/}
}
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Hulek, Klaus; Kahn, Constantin; Weintraub, Steven H. Singularities of the moduli spaces of certain abelian surfaces. Compositio Mathematica, Tome 79 (1991) no. 2, pp. 231-253. https://www.numdam.org/item/CM_1991__79_2_231_0/

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