@misc{indiciae4fb04d07725f,
  title = {[Device for measuring an instantaneous frequency].},
  author = {N P Alekseev and P F Afanasenko and V I Il'in},
  year = {1977},
  url = {https://pubmed.ncbi.nlm.nih.gov/598552/},
  note = {Source identifier: 598552}
}