@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040253,
 author = {Koike, Masanobu},
 issue = {2},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {371--396},
 title = {On the Isomorphism Classes of Iwasawa Modules Associated to Imaginary Quadratic Fields with $λ = 2$},
 volume = {6},
 year = {1999}
}