@article{LázaroPlaza:56789,
      author        = "Lázaro Plaza, Jesús and Nam, Yunyoung and Gil Herrando,
                       Eduardo and Laguna Lasaosa, Pablo and Chon, Ki",
      title         = "{Respiratory rate derived from smartphone-camera-acquired
                       pulse photoplethysmographic signals}",
      year          = "2015",
}