Class number calculation of a cubic field from the elliptic unit. Ken Nakamula — 1982 Journal für die reine und angewandte Mathematik
Class number calculation of a quartic field from the elliptic unit Ken Nakamula — 1985 Acta Arithmetica
Class number calculation of a sextic field from the elliptic unit Ken Nakamula — 1985 Acta Arithmetica