1Luis M. Vaquero, Luis Rodero - Merino, Juan Caceres, Maik Lindner. A Break in the Clouds:towards a cloud definition [J]. ACM SIGCOMM Comupter Communication Review,2009, 39(1) :50 -54.
3Richard Heeks. Reinventing Government in the Infor- mation Age:International Practice in IT- enabled Public Sector Reform[M]. New York: Routledge, 2001.