@misc{indiciae4fa6c9061949,
  title = {Online process control for directional solidification by ultrasonic pulse echo technique.},
  author = {A Drevermann and C Pickmann and R Tiefers and G Zimmermann},
  year = {2004},
  doi = {10.1016/j.ultras.2004.01.010},
  url = {https://pubmed.ncbi.nlm.nih.gov/15047269/},
  note = {Source identifier: 15047269}
}