@misc{indiciae20170ed6e481,
  title = {Beta-galactosidase. In vivo -complementation.},
  author = {M Villarejo and P J Zamenhof and I Zabin},
  year = {1972},
  url = {https://pubmed.ncbi.nlm.nih.gov/4552692/},
  note = {Source identifier: 4552692}
}