@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042244,
 author = {Nakamura, Tsuyoshi and Ohashi, Hiroshi},
 month = {Feb},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Productivity, Capital Utilization, and Intra-firm Diffusion: A Study of Steel Refining Furnaces},
 year = {2007}
}