1.International diffusion of steel technologies: Time-lag and the speed of diffusion
Kazimierz Z. Poznanski
Technological Forecasting and Social Change
Volume 23, Issue 4, August 1983, Pages 305-323
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V71-45P0D11-15&_user=2018000&_coverDate=08%2F31%2F1983&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1655857590&_rerunOrigin=google&_acct=C000050602&_version=1&_urlVersion=0&_userid=2018000&md5=9041fe1a9c0026bb83cb7507eaf4a4ef&searchtype=a
2.The international diffusion of new information technologies
Cristiano Antonelli
Research Policy
Volume 15, Issue 3, June 1986, Pages 139-147
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V77-45D0RNT-7M&_user=2018000&_coverDate=06%2F30%2F1986&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1655852627&_rerunOrigin=google&_acct=C000050602&_version=1&_urlVersion=0&_userid=2018000&md5=46e1b1f9937f33627fa476c82672723e&searchtype=a