@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042382,
 author = {Clements, Matthew T. 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 = {Indirect Network Effects and the Product Cycle : Video Games in the U.S., 1994-2002},
 year = {2004}
}