@article{13812, author = {{PĆ¼ttmer, A. and Lucklum, R. and Henning, Bernd and Hauptmann, P.}}, issn = {{0924-4247}}, journal = {{Sensors and Actuators A: Physical}}, pages = {{8--12}}, title = {{{Improved ultrasonic density sensor with reduced diffraction influence}}}, doi = {{10.1016/s0924-4247(97)01720-2}}, year = {{2002}}, }