An Arithmetic of Hermitian Modular Forms of Degree Two. Hisashi Kojima — 1982 Inventiones mathematicae
Shimura correspondence of Maass wave forms of half integral weight Hisashi Kojima — 1995 Acta Arithmetica
On explicit construction of Hilbert-Siegel modular forms of degree two Hisashi Kojima — 1997 Acta Arithmetica