1. Introduction to the SIRIUS 1 Microcomputer, Part No. 100909-01A,1982
2. Data base interaction using a hand print terminal;Barker;International Journal of Man-Machine Studies,1982
3. Data base support for pictorial interfaces;Barker,1984
4. Dialogue protocols for use with pictorial interfaces;Barker,1984
5. User Experiences with a MICRO PAD;Barker;Journal of Microcomputer Applications,1984