@INPROCEEDINGS{Zahn-WCMPBE-1994,
  author = {Zahn, {\relax Th}omas Peter and Nagel, Joachim H. and Agatston, Arthur
    S.},
  title = {Quantification of Aortic Stenosis Based on the Morphology of Doppler
    Ultrasound Signals Using Image Processing Techniques},
  booktitle = {World Congress on Medical Physics and Biomedical Engineering (WCMPBE)},
  year = {1994},
  pages = {973--977}
}