Latest versions of the programs introduced in this paper: http://www.it.lut.fi/project/sms/
Some information about operation of GSM and SMS technology: SMS message volumes in different countries: http://www.gsm.org/
A list of service providers and protocols supported by SMS Client: http://www.styx.demon.co.uk/
Details on the mail2sms program: http://www.contactor.se/~dast/mail2sms/
``Overview of the Global System for Mobile Communications" by John Scourias: http://ccnga.uwaterloo.ca/~jscouria/GSM/gsmreport.html
Simple SMS interface programs for GSM devices: http://w3.sztaki.hu:1980/~kissg/gsm/
gnokii Project: http://gnokii.org/
Forum for Nokia-related development: http://www.forum.nokia.com/
Communication through serial port: http://www.easysw.com/~mike/serial/
For information on the wireless markets since the inception of the industry in the early 1980s: http://www.emc-database.com/