@misc{indiciaee9679f20b12d,
  title = {[Combined operations].},
  author = {S S Pchel'nikov and Sh A Tenchurin and A P Pashkov},
  year = {1990},
  url = {https://pubmed.ncbi.nlm.nih.gov/2292839/},
  note = {Source identifier: 2292839}
}