Surjectivity of Siegel $\Phi$-operator for square free level and small weight

Böcherer, Siegfried; Ibukiyama, Tomoyoshi

Annales de l'Institut Fourier, Volume 62 (2012) p. 121-144

On the field of definition of superspecial polarized abelian varieties and type numbers

Ibukiyama, Tomoyoshi; Katsura, Toshiyuki

Compositio Mathematica, Volume 91 (1994) p. 37-46

Supersingular curves of genus two and class numbers

Ibukiyama, Tomoyoshi; Katsura, Toshiyuki; Oort, Frans

Compositio Mathematica, Volume 57 (1986) p. 127-152