Ramification and units of the cubic number field Q(zeta) generated by a root of x3+abx+B=0 J. R. Delgado — 1987 Extracta Mathematicae
Some questions concerning the cubic number Q(o) generates by a root of x3+abx+B=0. J. R. Delgado Pérez — 1986 Extracta Mathematicae