TY - JOUR AU - Kiyoaki Iimura TI - Dihedral extensions of Q of degree 21 which contain non-Galois extensions with class number not divisible by l JO - Acta Arithmetica PY - 1979 SP - 385 EP - 394 VL - 35 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/aa-35-4-385-394/ DO - 10.4064/aa-35-4-385-394 LA - en ID - 10_4064_aa_35_4_385_394 ER -