- keywords = "ELDEN learning system, adaptive place network, dead reckoning, dynamic environments, evidence grids, hill-climbing algorithm, lasting changes, mobile robot localization, navigation, position estimate, transient changes, learning systems, mobile robots, navigation, path planning, position control, sonar, ultrasonic transducer arrays",
+ keywords = "adaptive place network, dead reckoning, dynamic environments, ELDEN learning system, evidence grids, hill-climbing algorithm, lasting changes, learning systems, mobile robot localization, mobile robots, navigation, path planning, position control, position estimate, sonar, transient changes, ultrasonic transducer arrays",