On Elliptic Units and Class Number of a Certain Non-Galois Number Field. Heima Hayashi — 1983 Manuscripta mathematica
Note on an index formula of elliptic units in a ring class field Heima Hayashi — 1985 Acta Arithmetica
On elliptic units and class number of a certain dihedral extension of degree 2l Heima Hayashi — 1984 Acta Arithmetica
Note on an index formula of elliptic units in a ring class field II Heima Hayashi — 1988 Acta Arithmetica
Note on a product formula for the Bayad function and a law of quadratic reciprocity Heima Hayashi — 2011 Acta Arithmetica
On some equalities for the Weierstrass modular units of level p Heima Hayashi — 2006 Acta Arithmetica