3. APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart M. Weiser, " The computer for the 21 st century " SIGMOBILE Mobile Computing and Communications Review , vol. 3, no. 3, pp. 3-11, 1999.
4. A. L. Kun, W. T. Miller, III, and W. H. Lenharth, " Computers in police cruisers ," Pervasive Computing, IEEE , vol. 3, no. 4, pp. 34-41, 2004. APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart
5. APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart
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9. APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart Voice communication line Radio Channel
10. Voice communication line APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart Radio Channel - TDMA voice data voice voice voice data A single data line
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16. APCO P25 Wireless Data Services for Smaller Public Safety Agencies – Ivan Elhart Project54 – CATLab University of New Hampshire