I'm looking these papers
C. Fritsch, J. J. Anaya, A. Ruiz, and L. G. Ullate. A high-resolution object recognition ultrasonic system.Sensors and Actuators A, 3738:644650, 1993.
J. M. Martín Abreu, T. Freire Bastos, and L. Calderón. Ultrasonic echoes from complex surfaces: anapplication to object recognition. Sensors and Actuators A, 31:182187, 1992.
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