1. Ghribi, B., Logrippo, L.: Understanding GPRS: the GSM packet radio service. Computer Networks (Amsterdam, Netherlands: 1999) 34, 763–779 (2000)
2. Lecture Notes in Computer Science;M. Mock,1999
3. O’Mahony, D.: Umts: The fusion of fixed and mobile networking. IEEE Internet Computing 2, 49–56 (1998)
4. IETF: Internet Message Access Protocol (IMAP) - version 4rev1 (1996) Request for Comments 2060
5. Mullet, D., Mullet, K.: Managing IMAP. O’Reilly, Sebastopol (2000)