@misc{indiciae5825a33c5047,
  title = {Problems using density gradients. Brief report.},
  author = {G H Bergold and R Mazzali},
  year = {1970},
  doi = {10.1007/bf01241674},
  url = {https://pubmed.ncbi.nlm.nih.gov/5529070/},
  note = {Source identifier: 5529070}
}