@misc{indiciae1fc692cac0d0,
  title = {[Operational lowclearance "PCh" clock].},
  author = {E L BELETSKII and I G OSMOLOVSKAIA},
  year = {1961},
  url = {https://pubmed.ncbi.nlm.nih.gov/13866730/},
  note = {Source identifier: 13866730}
}