@misc{oai:niigata-u.repo.nii.ac.jp:00004790,
 author = {Hasegawa, Atsushi},
 month = {Mar},
 note = {新大院博（理）甲第259号, 新大院博（理）甲第259号},
 title = {Invariant subspaces of L2(T2）　for irrational rotation unitary systems},
 year = {2006}
}