%0 Journal Article %A Akiko Ito %T On certain infinite families of imaginary quadratic fields whose Iwasawa $\lambda $-invariant is equal to 1 %J Acta Arithmetica %D 2015 %P 301-339 %V 168 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa168-4-1/ %R 10.4064/aa168-4-1 %G en %F 10_4064_aa168_4_1