@misc{indiciae5eb5d1198b6d,
  title = {A simple and cheap device for gradient formation.},
  author = {K Dreyer and B Opalka and H Schulte-Holthausen},
  year = {1991},
  doi = {10.1093/nar/19.6.1348},
  url = {https://pubmed.ncbi.nlm.nih.gov/2030956/},
  note = {Source identifier: 2030956}
}