@article{Singer2019,
  author    = {Wolf Singer},
  title     = {A naturalistic approach to the hard problem of consciousness},
  journal   = {Frontiers in systems neuroscience},
  volume    = {13},
  number    = {Art. 58},
  pages     = {1 -- 9},
  doi       = {10.3389/fnsys.2019.00058},
  year      = {2019},
}