@misc{indiciae2a2335f8a3c3,
  title = {[An improved spirograph the Spiro 2-25].},
  author = {A I Gudkov and A V Frolov},
  year = {1986},
  url = {https://pubmed.ncbi.nlm.nih.gov/3750903/},
  note = {Source identifier: 3750903}
}