@article{ Marcus_Westervelt89,
  author = {C. M. Marcus and R. H. Westervelt},
  title = {Stability of analog neural networks with delay},
  journal = { Phys Rev. A},
  year = { 1990},
  volume = { 39},
  pages = {347},
  number = {1},
  en_number = {1.8:4}
}