@misc{indiciaeffde208a9d33,
  title = {Density gradient system. II. A 50 channel programmable undulating diaphragm peristaltic pump.},
  author = {R C Leif},
  year = {1968},
  doi = {10.1016/0003-2697(68)90103-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/5704750/},
  note = {Source identifier: 5704750}
}