@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042188, author = {Kamiya, Kazuya and Sato, Meg}, month = {Apr}, note = {application/pdf, 本文フィルはリンク先を参照のこと}, title = {Multi-period Contract Problems with Verifiable and Unverifiable Outputs}, year = {2011} }