@misc{indiciaecdcfa1310bd2,
  title = {The vacuum effect in impression-taking.},
  author = {B Bergman and C O Olsson and K A Olsson and R Söremark},
  year = {1969},
  url = {https://pubmed.ncbi.nlm.nih.gov/4911581/},
  note = {Source identifier: 4911581}
}