4M. A. Goncalves. Streams Structures, Spaces, Scenarios, and Societies(5S): A Formal Digital Library Framework and Its Applications[D]. Virginia: Virginia Tech, Blacksbnrg, 2004.
6Sandor Darfiny, Peter Wittek, Milena Dobreva. Toward a 5M model of digital libraries [C]//Proceedings for Digital Libraries for International Development. Surfers Paradise Gold Cosat Australia, 2010.
7Jay Jordan. Library Management Services in the Cloud: More Reality Than Dream[EB/OL]. [2011- 01-09]. http://www, oclc. org.