On the field of definition of superspecial polarized abelian varieties and type numbers
Compositio Mathematica, Tome 91 (1994) no. 1, pp. 37-46. 
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Ibukiyama, Tomoyoshi; Katsura, Toshiyuki. On the field of definition of superspecial polarized abelian varieties and type numbers. Compositio Mathematica, Tome 91 (1994) no. 1, pp. 37-46. http://archive.numdam.org/item/CM_1994__91_1_37_0/

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