1. Chow, W. L., On the quotient variety of an abelian variety, Proc. Nat. Acad. Sci. U.S. A., 38, 1039–1044 (1952).
2. Hironaka, H., A note on algebraic geometry over ground rings. The invariance of Hilbert characteristic functions under the specialization process, Illinois J. Matlz., 2, 355–366 (1958).
3. Igusa, J., Arithmetic genera of normal varieties in an algebraic family, Proc. Nat. Acad. Sci. U.S. A., 41, 34–37 (1955).
4. Koizumi, S., On the differential forms of the first kind on algebraic varieties, J. Math. Soc. Japan, 1, 273–280 (1949).
5. Nishi, M., Some results on abelian varieties, Nat. Sci. Rep., Ochanomizu Univ., 9, 1–12 (1958).