@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042583,
 author = {Tsukuma, Hisayuki and Kubokawa, Tatsuya},
 month = {Dec},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Simultaneous estimation of normal precision matrices},
 year = {2006}
}