Rautenberg, Jens, and Bernd Henning. “New Approach for the Reliable Measurement of Acoustic Impedance of Liquids in an Acoustic Waveguide,” II:87–92, 2007.

Vössing, Torsten, Jens Rautenberg, Romina Kehl, and Bernd Henning. “Simultaneous Transmitting and Receiving with Ultrasonic Sensors,” 2007.