@misc{indiciae126a2cc921fd,
  title = {Theory and practice.},
  author = {U Halbreich},
  year = {1990},
  doi = {10.1016/0006-3223(90)90450-g},
  url = {https://pubmed.ncbi.nlm.nih.gov/1978688/},
  note = {Source identifier: 1978688}
}