no. 2
Supersingular curves of genus two and class numbers
Compositio Mathematica, Tome 57 (1986) no. 2, pp. 127-152. 
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     author = {Ibukiyama, Tomoyoshi and Katsura, Toshiyuki and Oort, Frans},
     title = {Supersingular curves of genus two and class numbers},
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     pages = {127--152},
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     volume = {57},
     number = {2},
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     zbl = {0589.14028},
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     url = {http://archive.numdam.org/item/CM_1986__57_2_127_0/}
}
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Ibukiyama, Tomoyoshi; Katsura, Toshiyuki; Oort, Frans. Supersingular curves of genus two and class numbers. Compositio Mathematica, Tome 57 (1986) no. 2, pp. 127-152. http://archive.numdam.org/item/CM_1986__57_2_127_0/

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