@article{JMLR:v16:hermans15a,
  author  = {Michiel Hermans and Miguel C. Soriano and Joni Dambre and Peter Bienstman and Ingo Fischer},
  title   = {Photonic Delay Systems as Machine Learning Implementations},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {64},
  pages   = {2081--2097},
  url     = {http://jmlr.org/papers/v16/hermans15a.html}
}