Elmer Elsie Robots by Grey Walter - The Old Robot's Web Site
Grey Walter Constructs the First Electronic Autonomous Robots; the Origin of Social Robotics : History of Information
Jibo - Robots in History: Elmer and Elsie (1948) built by William Grey Walter, these "tortoises" were the first autonomous electronic robots capable of complex behavior. They demonstrated the neurological principle that
1948 - ELSIE (Electro-mechanical robot, Light Sensitive with Internal and External stability ) - W. Grey Walter - cyberneticzoo.com
Tortoise" Mobile Robot | National Museum of American History
Elmer Elsie Robots by Grey Walter - The Old Robot's Web Site
2008: Grey Walter and his tortoises | News and features | University of Bristol
Introduction to Robotics - ppt video online download
ELSIE-Time-Life1950 | Elsie, Elmer, Archive
Meet the Roomba's Ancestor: The Cybernetic Tortoise - IEEE Spectrum