@article{13810,
  author       = {{Hauptmann, Peter and Lucklum, Ralf and Püttmer, Alf and Henning, Bernd}},
  journal      = {{Sensors and Actuators A: Physical}},
  number       = {{1-3}},
  pages        = {{32--48}},
  title        = {{{Ultrasonic sensors for process monitoring and chemical analysis state of the art and trends}}},
  doi          = {{10.1016/S0924-4247(97)01725-1}},
  volume       = {{67}},
  year         = {{1998}},
}