Classification of plant species from CTFM ultrasonic range data using a neural network. - Neil L. Harper; Phillip J. McKerrow (ICNN, 1995)

Recognition of plants with CTFM ultrasonic range data using a neural network. - Neil L. Harper; Phillip J. McKerrow (ICRA, 1997)

Recognising plants with ultrasonic sensing for mobile robot navigation. - Neil L. Harper; Phillip J. McKerrow (Robotics Auton. Syst., 2001)