TY - JOUR AU - Keiji Okano TI - Abelian $p$-class field towers over the cyclotomic $\mathbb {Z}_p$-extensions of imaginary quadratic fields JO - Acta Arithmetica PY - 2006 SP - 363 EP - 381 VL - 125 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/aa125-4-5/ DO - 10.4064/aa125-4-5 LA - en ID - 10_4064_aa125_4_5 ER -