1. Noncontact Ranging Systems for Mobile Robots;Everett;Sensors,1987
2. Robotic Sensing Devices;Hall;Carnegie-Mellon University Report No. CMU-RI-TR-84-3,1984
3. Koenigsburg, W.D., “Noncontact Distance Sensor Technology,” GTE Laboratories Incorporated (incomplete info).
4. Robotics in the Navy;Everett,1985
5. A Second Generation Autonomous Sentry Robot;Everett,1985