no. 2
Families of supersingular abelian surfaces
Compositio Mathematica, Tome 62 (1987) no. 2, pp. 107-167. 
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     number = {2},
     year = {1987},
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Katsura, Toshiyuki; Oort, Frans. Families of supersingular abelian surfaces. Compositio Mathematica, Tome 62 (1987) no. 2, pp. 107-167. http://archive.numdam.org/item/CM_1987__62_2_107_0/

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