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3. D. A. Cahlander, The Determination of Distance by Echolocation Bats, Nature London, 1964. (a)
4. D. A. Cahlander, Echolocation with Wide-Band Waveforms: Bat Sonar Signals, Tech. Rep. Lincoln Lab MIT, 1964. (b)
5. R. Chatila, Système de Navigation pour un Robot Mobile Autonome: modélisations et processus décisionnels, Thèse: Université Paul Sabatier, Toulouse France, 1981.