1. Cheverst, Keith, et al. (2000): Providing tailored (context-aware) inf. to city visitors. Berlin/Heidelberg: Springer.
2. CLDC: Connected Limited Device Config., Java 2ME version 1.0. http://java.sun.com/about Java/communityprocess/final/jsr030/.
3. Harold, Elliotte R. (2001). The XML Bible, 2nd ed. New York: Hungry Minds Inc.
4. JTAPI: Java Telephony API, JTAPI version 1.3. http://java.sun.com/products/jtapi/.
5. MIDP: Mobile Information Device Profile, Java 2ME version 1.0. http://java.sun.com/aboutJava/communityprocess/final/jsr037/.